Staging: greybus: Blank lines not required before '}'

Remove blank line to resolve checkpatch.pl issue:
CHECK: Blank lines aren't necessary before a close brace '}'
Signed-off-by: Bhanusree Pola <bhanusreemahesh@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/greybus/audio_topology.c

@@ -923,7 +923,6 @@ static int gbaudio_tplg_create_wcontrol(struct gbaudio_module_info *gb,
 		break;
 	default:
 		return -EINVAL;
-
 	}
 
 	dev_dbg(gb->dev, "%s:%d DAPM control created, ret:%d\n", ctl->name,