Postfix/prefix increment evaluation order is not changed by parantheses. Use '+ 1' for readability instead. CID 2983.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39965 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/generic/dpc/dpc.c

@@ -178,7 +178,7 @@ queue_dpc(void *handle, dpc_func function, void *arg)
 	else {
 		queue->slots[queue->tail].function = function;
 		queue->slots[queue->tail].arg      = arg;
-		queue->tail = (queue->tail++) % queue->size;
+		queue->tail = (queue->tail + 1) % queue->size;
 		queue->count++;
 	}