drm/amd/display: Fix warning in freesync module

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/modules/freesync/freesync.c

@@ -746,6 +746,9 @@ void mod_freesync_update_state(struct mod_freesync *mod_freesync,
 				freesync_program_required = true;
 			}
 			break;
+		case FREESYNC_STATE_NONE:
+			/* handle here to avoid warning */
+			break;
 		}
 	}