kbuild: Fix tolower() usage in scripts/fixdep.c

Not that it matters, since it's only used with 7bit chars, but
anyway.

1 files changed, 1 insertions, 1 deletions

diff --git a/scripts/fixdep.c b/scripts/fixdep.c
index 07c927c58f3f..4a42364ab18a 100644
--- a/scripts/fixdep.c
+++ b/scripts/fixdep.c
@@ -214,7 +214,7 @@ void use_config(char *m, int slen)
 		if (*p == '_')
 			*p = '/';
 		else
-			*p = tolower(*p);
+			*p = tolower((unsigned char)*p);
 	}
 	printf("    $(wildcard %s/include/config/%s.h) \\\n", topdir, s);
 }