[PATCH] btrfs-progs: fix a printf format string fatal warning

[Adam Borowski]

At least in Debian, default build flags include -Werror=format-security,
for good reasons in most cases.  Here, the string comes from strftime --
and though I don't suspect any locale would be crazy enough to have %X
include a '%' char, the compiler has no way to know that.

Signed-off-by: Adam Borowski <kilob...@angband.pl>
---
 common/format-output.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/common/format-output.c b/common/format-output.c
index c5f1b51f..98fb8607 100644
--- a/common/format-output.c
+++ b/common/format-output.c
@@ -280,7 +280,7 @@ void fmt_print(struct format_ctx *fctx, const char* key, 
...)
 
                        localtime_r(&ts, &tm);
                        strftime(tstr, 256, "%Y-%m-%d %X %z", &tm);
-                       printf(tstr);
+                       printf("%s", tstr);
                } else {
                        putchar('-');
                }
-- 
2.22.0