[PATCH v2 12/21] commit.c: report error on failure to fopen() the graft file

[Nguyễn Thái Ngọc Duy]

Suppressing the error (because the command requires --quiet) is not a
concern because we already call error() just a couple lines down.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 commit.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/commit.c b/commit.c
index 73c78c2b80..075607a6da 100644
--- a/commit.c
+++ b/commit.c
@@ -167,10 +167,12 @@ 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;
+
        while (!strbuf_getwholeline(&buf, fp, '\n')) {
                /* The format is just "Commit Parent1 Parent2 ...\n" */
                struct commit_graft *graft = read_graft_line(buf.buf, buf.len);
-- 
2.11.0.157.gd943d85