[PATCH] kconfig: fix return value of do_error_if()

[Masahiro Yamada]

Kconfig expands a macro to a string. $(error-if,...) should be expanded
to an empty string, not NULL.

Fixes: 1d6272e6fe43 ("kconfig: add 'info', 'warning-if', and 'error-if' 
built-in functions")
Signed-off-by: Masahiro Yamada <masahi...@kernel.org>
---

 scripts/kconfig/preprocess.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/kconfig/preprocess.c b/scripts/kconfig/preprocess.c
index 0243086fb168..0590f86df6e4 100644
--- a/scripts/kconfig/preprocess.c
+++ b/scripts/kconfig/preprocess.c
@@ -114,7 +114,7 @@ static char *do_error_if(int argc, char *argv[])
        if (!strcmp(argv[0], "y"))
                pperror("%s", argv[1]);
 
-       return NULL;
+       return xstrdup("");
 }
 
 static char *do_filename(int argc, char *argv[])
-- 
2.27.0