[PATCH v3] write_pack_file: use correct variable in diagnostic

'pack_tmp_name' is the subject of the utime() check, so report it in the
warning, not the uninitialized 'tmpname'

Signed-off-by: Sun He <redacted>
---

 Changing the subject and adding valid information as tutored by 
 Eric Sunshine.
 Thanks to him.

 builtin/pack-objects.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/builtin/pack-objects.c b/builtin/pack-objects.c
index c733379..4922ce5 100644
--- a/builtin/pack-objects.c
+++ b/builtin/pack-objects.c

@@ -823,7 +823,7 @@ static void write_pack_file(void)
 				utb.modtime = --last_mtime;
 				if (utime(pack_tmp_name, &utb) < 0)
 					warning("failed utime() on %s: %s",
-						tmpname, strerror(errno));
+						pack_tmp_name, strerror(errno));
 			}
 
 			/* Enough space for "-<sha-1>.pack"? */

-- 
1.9.0.138.g2de3478.dirty