print errno when reporting a system call error

diff --git a/commit.c b/commit.c
index 73c78c2b80c1a21e83f1942347a76fb76511a0d3..3eeda081f9bf9a765f41d44579cf5ee016bae129 100644 (file)
--- a/commit.c
+++ b/commit.c
@@ -167,7 +167,7 @@ struct commit_graft *read_graft_line(char *buf, int len)
 
 static int read_graft_file(const char *graft_file)
 {
-       FILE *fp = fopen(graft_file, "r");
+       FILE *fp = fopen_or_warn(graft_file, "r");
        struct strbuf buf = STRBUF_INIT;
        if (!fp)
                return -1;