btrfs-progs: getopt, use symbolic name for argument requirements

Signed-off-by: David Sterba <dsterba@suse.cz>

1 files changed, 1 insertions, 1 deletions

diff --git a/cmds-subvolume.c b/cmds-subvolume.c
index a31cb1b8..3d5a766f 100644
--- a/cmds-subvolume.c
+++ b/cmds-subvolume.c
@@ -404,7 +404,7 @@ static int cmd_subvol_list(int argc, char **argv)
 	while(1) {
 		int c;
 		static const struct option long_options[] = {
-			{"sort", 1, NULL, 'S'},
+			{"sort", required_argument, NULL, 'S'},
 			{NULL, 0, NULL, 0}
 		};