[SCSI] cxgbi3: remove unnecessary NULL test

Stanse found that c3cn is poked many times around in
cxgb3i_conn_pdu_ready, there is no need to check if it is NULL.

Remove the test.

Signed-off-by: Jiri Slaby <[e-mail]>
Reviewed-by: Mike Christie <[e-mail]>
Acked-by: Karen Xie <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: James Bottomley <[e-mail]>

drivers/scsi/cxgb3i/cxgb3i_pdu.c

···
 		skb = skb_peek(&c3cn->receive_queue);
 	}
 	read_unlock(&c3cn->callback_lock);
-	if (c3cn) {
-		c3cn->copied_seq += read;
-		cxgb3i_c3cn_rx_credits(c3cn, read);
-	}
+	c3cn->copied_seq += read;
+	cxgb3i_c3cn_rx_credits(c3cn, read);
 	conn->rxdata_octets += read;
 
 	if (err) {