refname_is_safe(): don't allow the empty string

Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu>

1 files changed, 3 insertions, 2 deletions

diff --git a/refs.c b/refs.c
index 5789152743..ca0280f7eb 100644
--- a/refs.c
+++ b/refs.c
@@ -136,11 +136,12 @@ int refname_is_safe(const char *refname)
 		free(buf);
 		return result;
 	}
-	while (*refname) {
+
+	do {
 		if (!isupper(*refname) && *refname != '_')
 			return 0;
 		refname++;
-	}
+	} while (*refname);
 	return 1;
 }