scsi: lpfc: lpfc_nvme: Mark expected switch fall-through

In preparation to enabling -Wimplicit-fallthrough, mark switch cases
where we are expecting to fall through.
Reviewed-by: NKees Cook <keescook@chromium.org>
Signed-off-by: NGustavo A. R. Silva <gustavo@embeddedor.com>

drivers/scsi/lpfc/lpfc_nvme.c

@@ -1106,6 +1106,7 @@ lpfc_nvme_io_cmd_wqe_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pwqeIn,
 					 lpfc_ncmd, nCmd,
 					 lpfc_ncmd->cur_iocbq.sli4_xritag,
 					 bf_get(lpfc_wcqe_c_xb, wcqe));
+			/* fall through */
 		default:
 out_err:
 			lpfc_printf_vlog(vport, KERN_INFO, LOG_NVME_IOERR,