ray_cs: mark expected switch fall-throughs

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

Addresses-Coverity-ID: 114948 ("Missing break in switch")
Addresses-Coverity-ID: 114949 ("Missing break in switch")
Signed-off-by: Gustavo A. R. Silva <[e-mail]>
Signed-off-by: Kalle Valo <[e-mail]>

drivers/net/wireless/ray_cs.c

···
 	switch (ccsindex = get_free_tx_ccs(local)) {
 	case ECCSBUSY:
 		pr_debug("ray_hw_xmit tx_ccs table busy\n");
+		/* fall through */
 	case ECCSFULL:
 		pr_debug("ray_hw_xmit No free tx ccs\n");
+		/* fall through */
 	case ECARDGONE:
 		netif_stop_queue(dev);
 		return XMIT_NO_CCS;