NFC: st21nfca: Fix sparse: cast to restricted __be16

Fixing "sparse: cast to restricted __be16" message when building with
make C=1 CF=-D__CHECK_ENDIAN__

Signed-off-by: Christophe Ricard <[e-mail]>
Signed-off-by: Samuel Ortiz <[e-mail]>

drivers/nfc/st21nfca/st21nfca.c

···
 		goto exit;
 	}
 
-	*atqa = be16_to_cpu(*(u16 *) atqa_skb->data);
+	*atqa = be16_to_cpu(*(__be16 *) atqa_skb->data);
 
 exit:
 	kfree_skb(atqa_skb);