net: bna: Use fallthrough pseudo-keyword

Replace /* !!! fall through !!! */ comments with the new pseudo-keyword
macro fallthrough[1].

[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-throughSigned-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/brocade/bna/bfa_ioc.c

@@ -269,7 +269,7 @@ bfa_ioc_sm_enabling(struct bfa_ioc *ioc, enum ioc_event event)
 		break;
 
 	case IOC_E_PFFAILED:
-		/* !!! fall through !!! */
+		fallthrough;
 	case IOC_E_HWERROR:
 		ioc->cbfn->enable_cbfn(ioc->bfa, BFA_STATUS_IOC_FAILURE);
 		bfa_fsm_set_state(ioc, bfa_ioc_sm_fail);
@@ -365,7 +365,8 @@ bfa_ioc_sm_op(struct bfa_ioc *ioc, enum ioc_event event)
 	case IOC_E_PFFAILED:
 	case IOC_E_HWERROR:
 		bfa_ioc_hb_stop(ioc);
-		/* !!! fall through !!! */
+		fallthrough;
+
 	case IOC_E_HBFAIL:
 		if (ioc->iocpf.auto_recover)
 			bfa_fsm_set_state(ioc, bfa_ioc_sm_fail_retry);