scsi: sym53c8xx_2: sym_hipd: mark expected switch fall-throughs

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

Addresses-Coverity-ID: 114996 ("Missing break in switch")
Reviewed-by: NKees Cook <keescook@chromium.org>
Signed-off-by: NGustavo A. R. Silva <gustavo@embeddedor.com>

drivers/scsi/sym53c8xx_2/sym_hipd.c

@@ -3072,6 +3072,7 @@ static void sym_sir_bad_scsi_status(struct sym_hcb *np, int num, struct sym_ccb
 			sym_print_addr(cp->cmd, "%s\n",
 			        s_status == S_BUSY ? "BUSY" : "QUEUE FULL\n");
 		}
+		/* fall through */
 	default:	/* S_INT, S_INT_COND_MET, S_CONFLICT */
 		sym_complete_error (np, cp);
 		break;
@@ -4632,6 +4633,7 @@ static void sym_int_sir(struct sym_hcb *np)
 	 *  Negotiation failed.
 	 *  Target does not want answer message.
 	 */
+	/* fall through */
 	case SIR_NEGO_PROTO:
 		sym_nego_default(np, tp, cp);
 		goto out;