Move chmod(foo, 0444) into move_temp_to_file()

When writing out a loose object or a pack (index), move_temp_to_file() is
called to finalize the resulting file. These files (loose files and packs)
should all have permission mode 0444 (modulo adjust_shared_perm()).
Therefore, instead of doing chmod(foo, 0444) explicitly from each callsite
(or even forgetting to chmod() at all), do the chmod() call from within
move_temp_to_file().

Signed-off-by: Johan Herland <johan@herland.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/index-pack.c b/index-pack.c
index 7fee872..5dfe03e 100644
--- a/index-pack.c
+++ b/index-pack.c
@@ -823,8 +823,7 @@
 		}
 		if (move_temp_to_file(curr_pack_name, final_pack_name))
 			die("cannot store pack file");
-	}
-	if (from_stdin)
+	} else if (from_stdin)
 		chmod(final_pack_name, 0444);
 
 	if (final_index_name != curr_index_name) {
@@ -835,8 +834,8 @@
 		}
 		if (move_temp_to_file(curr_index_name, final_index_name))
 			die("cannot store index file");
-	}
-	chmod(final_index_name, 0444);
+	} else
+		chmod(final_index_name, 0444);
 
 	if (!from_stdin) {
 		printf("%s\n", sha1_to_hex(sha1));