builtin/multi-pack-index.c: don't handle 'progress' separately

Now that there is a shared 'flags' member in the options structure,
there is no need to keep track of whether to force progress or not,
since ultimately the decision of whether or not to show a progress meter
is controlled by a bit in the flags member.

Manipulate that bit directly, and drop the now-unnecessary 'progress'
field while we're at it.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/multi-pack-index.c

@@ -13,7 +13,6 @@ static char const * const builtin_multi_pack_index_usage[] = {
 static struct opts_multi_pack_index {
 	const char *object_dir;
 	unsigned long batch_size;
-	int progress;
 	unsigned flags;
 } opts;
 
@@ -23,7 +22,7 @@ int cmd_multi_pack_index(int argc, const char **argv,
 	static struct option builtin_multi_pack_index_options[] = {
 		OPT_FILENAME(0, "object-dir", &opts.object_dir,
 		  N_("object directory containing set of packfile and pack-index pairs")),
-		OPT_BOOL(0, "progress", &opts.progress, N_("force progress reporting")),
+		OPT_BIT(0, "progress", &opts.flags, N_("force progress reporting"), MIDX_PROGRESS),
 		OPT_MAGNITUDE(0, "batch-size", &opts.batch_size,
 		  N_("during repack, collect pack-files of smaller size into a batch that is larger than this size")),
 		OPT_END(),
@@ -31,15 +30,14 @@ int cmd_multi_pack_index(int argc, const char **argv,
 
 	git_config(git_default_config, NULL);
 
-	opts.progress = isatty(2);
+	if (isatty(2))
+		opts.flags |= MIDX_PROGRESS;
 	argc = parse_options(argc, argv, prefix,
 			     builtin_multi_pack_index_options,
 			     builtin_multi_pack_index_usage, 0);
 
 	if (!opts.object_dir)
 		opts.object_dir = get_object_directory();
-	if (opts.progress)
-		opts.flags |= MIDX_PROGRESS;
 
 	if (argc == 0)
 		usage_with_options(builtin_multi_pack_index_usage,