qcacld-3.0: umac: Replace fallthrough comment with attribute

-Wimplicit-fallthrough is being enabled by default. Some compilers
such as clang require the attribute instead of just a fallthrough comment.

Change-Id: I7a04c8727121f58a5d6dcd575446c9acedea164b
CRs-Fixed: 3216248

components/umac/mlme/connection_mgr/core/src/wlan_cm_roam_offload.c

@@ -3580,7 +3580,7 @@ cm_roam_switch_to_deinit(struct wlan_objmgr_pdev *pdev,
 			cm_roam_switch_to_rso_stop(pdev, vdev_id, reason,
 						   NULL, false);
 		}
-
+		break;
 	case WLAN_ROAM_INIT:
 		break;
 
@@ -3955,7 +3955,7 @@ cm_roam_switch_to_roam_start(struct wlan_objmgr_pdev *pdev,
 					    WLAN_ROAMING_IN_PROG);
 			break;
 		}
-		/* fallthrough */
+		fallthrough;
 	case WLAN_ROAM_INIT:
 	case WLAN_ROAM_DEINIT:
 	case WLAN_ROAM_SYNCH_IN_PROG:
@@ -4017,7 +4017,7 @@ cm_roam_switch_to_roam_sync(struct wlan_objmgr_pdev *pdev,
 		 * transition to WLAN_ROAM_SYNCH_IN_PROG not allowed otherwise
 		 * if we're already RSO stopped, fall through to return failure
 		 */
-		/* fallthrough */
+		fallthrough;
 	case WLAN_ROAM_INIT:
 	case WLAN_ROAM_DEINIT:
 	case WLAN_ROAM_SYNCH_IN_PROG:

components/umac/mlme/connection_mgr/dispatcher/src/wlan_cm_roam_api.c

@@ -2445,7 +2445,7 @@ cm_roam_event_handler(struct roam_offload_roam_event *roam_event)
 		if (roam_event->rso_timer_stopped)
 			wlan_cm_rso_stop_continue_disconnect(roam_event->psoc,
 						roam_event->vdev_id, true);
-		/* fallthrough */
+		fallthrough;
 	case ROAM_REASON_INVALID:
 		cm_handle_roam_offload_events(roam_event);
 		break;

components/umac/mlme/connection_mgr/dispatcher/src/wlan_cm_roam_ucfg_api.c

@@ -392,7 +392,7 @@ QDF_STATUS ucfg_cm_check_ft_status(struct wlan_objmgr_pdev *pdev,
 				   mlme_priv->connect_info.ft_info.ft_state);
 			break;
 		}
-		/* fallthrough */
+		fallthrough;
 	default:
 		mlme_debug("Unhandled state:%d",
 			   mlme_priv->connect_info.ft_info.ft_state);