scsi: isci: phy: Mark expected switch fall-through

In preparation to enabling -Wimplicit-fallthrough, mark switch cases where
we are expecting to fall through.

Addresses-Coverity-ID: 703127 ("Missing break in switch")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Acked-by: Artur Paszkiewicz <artur.paszkiewicz@intel.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/isci/phy.c

@@ -778,6 +778,7 @@ enum sci_status sci_phy_event_handler(struct isci_phy *iphy, u32 event_code)
 			break;
 		case SCU_EVENT_LINK_FAILURE:
 			scu_link_layer_set_txcomsas_timeout(iphy, SCU_SAS_LINK_LAYER_TXCOMSAS_NEGTIME_DEFAULT);
+			/* fall through */
 		case SCU_EVENT_HARD_RESET_RECEIVED:
 			/* Start the oob/sn state machine over again */
 			sci_change_state(&iphy->sm, SCI_PHY_STARTING);