nicer display of thin pack completion

In the same spirit of prettifying Git's output display for mere mortals,
here's a simple extension to the progress API allowing for a final
message to be provided when terminating a progress line, and use it for
the display of the number of objects needed to complete a thin pack,
saving yet one more line of screen display.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/index-pack.c b/index-pack.c
index 581a7f5..469a330 100644
--- a/index-pack.c
+++ b/index-pack.c
@@ -792,6 +792,7 @@
 		flush();
 	} else {
 		if (fix_thin_pack) {
+			char msg[48];
 			int nr_unresolved = nr_deltas - nr_resolved_deltas;
 			int nr_objects_initial = nr_objects;
 			if (nr_unresolved <= 0)
@@ -800,12 +801,11 @@
 					   (nr_objects + nr_unresolved + 1)
 					   * sizeof(*objects));
 			fix_unresolved_deltas(nr_unresolved);
-			stop_progress(&progress);
-			if (verbose)
-				fprintf(stderr, "%d objects were added to complete this thin pack.\n",
-					nr_objects - nr_objects_initial);
+			sprintf(msg, "completed with %d local objects",
+				nr_objects - nr_objects_initial);
+			stop_progress_msg(&progress, msg);
 			fixup_pack_header_footer(output_fd, sha1,
-				curr_pack, nr_objects);
+						 curr_pack, nr_objects);
 		}
 		if (nr_deltas != nr_resolved_deltas)
 			die("pack has %d unresolved deltas",