Those happens with "gcc -Wformat-zero-length".

Change empty strings to NULL now that it's allowed.

Signed-off-by: Benoit Pierre <benoit.pie...@gmail.com>
---
 builtin/commit.c |  2 +-
 wt-status.c      | 20 ++++++++++----------
 2 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/builtin/commit.c b/builtin/commit.c
index 3767478..6d19439 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -805,7 +805,7 @@ static int prepare_to_commit(const char *index_file, const 
char *prefix,
                                committer_ident.buf);
 
                if (ident_shown)
-                       status_printf_ln(s, GIT_COLOR_NORMAL, "");
+                       status_printf_ln(s, GIT_COLOR_NORMAL, NULL);
 
                saved_color_setting = s->use_color;
                s->use_color = 0;
diff --git a/wt-status.c b/wt-status.c
index 17f63a4..d9b1d00 100644
--- a/wt-status.c
+++ b/wt-status.c
@@ -189,7 +189,7 @@ static void wt_status_print_unmerged_header(struct 
wt_status *s)
        } else {
                status_printf_ln(s, c, _("  (use \"git add/rm <file>...\" as 
appropriate to mark resolution)"));
        }
-       status_printf_ln(s, c, "");
+       status_printf_ln(s, c, NULL);
 }
 
 static void wt_status_print_cached_header(struct wt_status *s)
@@ -205,7 +205,7 @@ static void wt_status_print_cached_header(struct wt_status 
*s)
                status_printf_ln(s, c, _("  (use \"git reset %s <file>...\" to 
unstage)"), s->reference);
        else
                status_printf_ln(s, c, _("  (use \"git rm --cached <file>...\" 
to unstage)"));
-       status_printf_ln(s, c, "");
+       status_printf_ln(s, c, NULL);
 }
 
 static void wt_status_print_dirty_header(struct wt_status *s,
@@ -224,7 +224,7 @@ static void wt_status_print_dirty_header(struct wt_status 
*s,
        status_printf_ln(s, c, _("  (use \"git checkout -- <file>...\" to 
discard changes in working directory)"));
        if (has_dirty_submodules)
                status_printf_ln(s, c, _("  (commit or discard the untracked or 
modified content in submodules)"));
-       status_printf_ln(s, c, "");
+       status_printf_ln(s, c, NULL);
 }
 
 static void wt_status_print_other_header(struct wt_status *s,
@@ -236,12 +236,12 @@ static void wt_status_print_other_header(struct wt_status 
*s,
        if (!s->hints)
                return;
        status_printf_ln(s, c, _("  (use \"git %s <file>...\" to include in 
what will be committed)"), how);
-       status_printf_ln(s, c, "");
+       status_printf_ln(s, c, NULL);
 }
 
 static void wt_status_print_trailer(struct wt_status *s)
 {
-       status_printf_ln(s, color(WT_STATUS_HEADER, s), "");
+       status_printf_ln(s, color(WT_STATUS_HEADER, s), NULL);
 }
 
 #define quote_path quote_path_relative
@@ -794,7 +794,7 @@ static void wt_status_print_other(struct wt_status *s,
        string_list_clear(&output, 0);
        strbuf_release(&buf);
 conclude:
-       status_printf_ln(s, GIT_COLOR_NORMAL, "");
+       status_printf_ln(s, GIT_COLOR_NORMAL, NULL);
 }
 
 void wt_status_truncate_message_at_cut_line(struct strbuf *buf)
@@ -1292,7 +1292,7 @@ void wt_status_print(struct wt_status *s)
                                on_what = _("Not currently on any branch.");
                        }
                }
-               status_printf(s, color(WT_STATUS_HEADER, s), "");
+               status_printf(s, color(WT_STATUS_HEADER, s), NULL);
                status_printf_more(s, branch_status_color, "%s", on_what);
                status_printf_more(s, branch_color, "%s\n", branch_name);
                if (!s->is_initial)
@@ -1305,9 +1305,9 @@ void wt_status_print(struct wt_status *s)
        free(state.detached_from);
 
        if (s->is_initial) {
-               status_printf_ln(s, color(WT_STATUS_HEADER, s), "");
+               status_printf_ln(s, color(WT_STATUS_HEADER, s), NULL);
                status_printf_ln(s, color(WT_STATUS_HEADER, s), _("Initial 
commit"));
-               status_printf_ln(s, color(WT_STATUS_HEADER, s), "");
+               status_printf_ln(s, color(WT_STATUS_HEADER, s), NULL);
        }
 
        wt_status_print_updated(s);
@@ -1324,7 +1324,7 @@ void wt_status_print(struct wt_status *s)
                if (s->show_ignored_files)
                        wt_status_print_other(s, &s->ignored, _("Ignored 
files"), "add -f");
                if (advice_status_u_option && 2000 < s->untracked_in_ms) {
-                       status_printf_ln(s, GIT_COLOR_NORMAL, "");
+                       status_printf_ln(s, GIT_COLOR_NORMAL, NULL);
                        status_printf_ln(s, GIT_COLOR_NORMAL,
                                         _("It took %.2f seconds to enumerate 
untracked files. 'status -uno'\n"
                                           "may speed it up, but you have to be 
careful not to forget to add\n"
-- 
1.9.0

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