staging: r8712u: Fix allocations not checked for failure

The driver has a dev_alloc_skb() and an skb_clone() call that are not
checked for failure.
Signed-off-by: NLarry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8712/rtl8712_recv.c

@@ -374,6 +374,8 @@ static int amsdu_to_msdu(struct _adapter *padapter, union recv_frame *prframe)
 		a_len -= ETH_HLEN;
 		/* Allocate new skb for releasing to upper layer */
 		sub_skb = dev_alloc_skb(nSubframe_Length + 12);
+		if (!sub_skb)
+			break;
 		skb_reserve(sub_skb, 12);
 		data_ptr = (u8 *)skb_put(sub_skb, nSubframe_Length);
 		memcpy(data_ptr, pdata, nSubframe_Length);
@@ -1094,6 +1096,8 @@ static int recvbuf2recvframe(struct _adapter *padapter, struct sk_buff *pskb)
 			precvframe->u.hdr.rx_end = pkt_copy->data + alloc_sz;
 		} else {
 			precvframe->u.hdr.pkt = skb_clone(pskb, GFP_ATOMIC);
+			if (!precvframe->u.hdr.pkt)
+				return _FAIL;
 			precvframe->u.hdr.rx_head = pbuf;
 			precvframe->u.hdr.rx_data = pbuf;
 			precvframe->u.hdr.rx_tail = pbuf;