qlcnic: Fix fall-through warnings for Clang

In preparation to enable -Wimplicit-fallthrough for Clang, fix multiple
warnings by explicitly adding a break and a goto statements instead of
just letting the code fall through to the next case.

Link: https://github.com/KSPP/linux/issues/115
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

drivers/net/ethernet/qlogic/qlcnic/qlcnic_io.c

@@ -1390,6 +1390,7 @@ static int qlcnic_process_rcv_ring(struct qlcnic_host_sds_ring *sds_ring, int ma
 			break;
 		case QLCNIC_RESPONSE_DESC:
 			qlcnic_handle_fw_message(desc_cnt, consumer, sds_ring);
+			goto skip;
 		default:
 			goto skip;
 		}

drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c

@@ -3455,6 +3455,7 @@ qlcnic_fwinit_work(struct work_struct *work)
 			adapter->fw_wait_cnt = 0;
 			return;
 		}
+		break;
 	case QLCNIC_DEV_FAILED:
 		break;
 	default: