wrapper.c: add and use fopen_or_warn()

When fopen() returns NULL, it could be because the given path does not
exist, but it could also be some other errors and the caller has to
check. Add a wrapper so we don't have to repeat the same error check
everywhere.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/rerere.c b/rerere.c
index 3bd55ca..971bfed 100644
--- a/rerere.c
+++ b/rerere.c
@@ -200,7 +200,7 @@ static struct rerere_id *new_rerere_id(unsigned char *sha1)
 static void read_rr(struct string_list *rr)
 {
 	struct strbuf buf = STRBUF_INIT;
-	FILE *in = fopen(git_path_merge_rr(), "r");
+	FILE *in = fopen_or_warn(git_path_merge_rr(), "r");
 
 	if (!in)
 		return;