scsi: dc395x: Use bitwise instead of arithmetic operator for flags

Fix the following coccicheck warnings:

./drivers/scsi/dc395x.c:2921:28-29: WARNING: sum of probable bitmasks,
consider |.

Link: https://lore.kernel.org/r/1615261153-32647-1-git-send-email-jiapeng.chong@linux.alibaba.comReported-by: Abaci Robot <abaci@linux.alibaba.com>
Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/dc395x.c

@@ -2918,7 +2918,7 @@ static void disconnect(struct AdapterCtlBlk *acb)
 	} else {
 		if ((srb->state & (SRB_START_ + SRB_MSGOUT))
 		    || !(srb->
-			 state & (SRB_DISCONNECT + SRB_COMPLETED))) {
+			 state & (SRB_DISCONNECT | SRB_COMPLETED))) {
 			/*
 			 * Selection time out 
 			 * SRB_START_ || SRB_MSGOUT || (!SRB_DISCONNECT && !SRB_COMPLETED)