Make git_oid_tostr use out buffer for NULL oid

Previously a NULL oid was handled like an empty buffer and
returned a status empty string.  This makes git_oid_tostr()
set the output buffer to the empty string instead.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/oid.c b/src/oid.c
index 1bf74b963..bbdd8541b 100644
--- a/src/oid.c
+++ b/src/oid.c
@@ -95,12 +95,12 @@ char *git_oid_tostr(char *out, size_t n, const git_oid *oid)
 {
 	char str[GIT_OID_HEXSZ];
 
-	if (!out || n == 0 || !oid)
+	if (!out || n == 0)
 		return "";
 
 	n--; /* allow room for terminating NUL */
 
-	if (n > 0) {
+	if (n > 0 && oid != NULL) {
 		git_oid_fmt(str, oid);
 		if (n > GIT_OID_HEXSZ)
 			n = GIT_OID_HEXSZ;