t4209: use helper functions to test --grep

diff --git a/convert.c b/convert.c
index 11a95fc8b5b5eea6de2014b9209e16f9a3422186..ab80b723574ff88b6c9c4a7c98c8821600f3e6bc 100644 (file)
--- a/convert.c
+++ b/convert.c
@@ -1121,7 +1121,7 @@ static int is_foreign_ident(const char *str)
 {
        int i;
 
-       if (prefixcmp(str, "$Id: "))
+       if (!starts_with(str, "$Id: "))
                return 0;
        for (i = 5; str[i]; i++) {
                if (isspace(str[i]) && str[i+1] != '$')