index-pack: be careful after fixing up the header/footer

The index-pack command, when processing a thin pack, fixed up the pack
after-the-fact.  It forgets to fsync the result, because it only did that
in one path rather in all cases of fixup.

This moves the fsync_or_die() to the fix-up routine itself, rather than
doing it in one of the callers, so that all cases are covered.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-pack-objects.c

@@ -499,7 +499,6 @@ static void write_pack_file(void)
 		} else {
 			int fd = sha1close(f, NULL, 0);
 			fixup_pack_header_footer(fd, sha1, pack_tmp_name, nr_written);
-			fsync_or_die(fd, pack_tmp_name);
 			close(fd);
 		}
 

pack-write.c

@@ -179,6 +179,7 @@ void fixup_pack_header_footer(int pack_fd,
 
 	SHA1_Final(pack_file_sha1, &c);
 	write_or_die(pack_fd, pack_file_sha1, 20);
+	fsync_or_die(pack_fd, pack_name);
 }
 
 char *index_pack_lockfile(int ip_out)