block, sx8: fix pointer math issue getting fw version

commit ea5f4db8 upstream.

"mem" is type u8.  We need parenthesis here or it screws up the pointer
math probably leading to an oops.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/block/sx8.c

@@ -1116,7 +1116,7 @@ static inline void carm_handle_resp(struct carm_host *host,
 			break;
 		case MISC_GET_FW_VER: {
 			struct carm_fw_ver *ver = (struct carm_fw_ver *)
-				mem + sizeof(struct carm_msg_get_fw_ver);
+				(mem + sizeof(struct carm_msg_get_fw_ver));
 			if (!error) {
 				host->fw_ver = le32_to_cpu(ver->version);
 				host->flags |= (ver->features & FL_FW_VER_MASK);