staging:r8188eu: avoid skb_clone for amsdu to msdu conversion

skb clones use same data buffer,
so tail of one skb is corrupted by beginning of next skb.
Signed-off-by: Ivan Safonov <insafonov@gmail.com>
Link: https://lore.kernel.org/r/20200423191404.12028-1-insafonov@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/core/rtw_recv.c

@@ -1525,20 +1525,13 @@ static int amsdu_to_msdu(struct adapter *padapter, struct recv_frame *prframe)
 
 		/* Allocate new skb for releasing to upper layer */
 		sub_skb = dev_alloc_skb(nSubframe_Length + 12);
-		if (sub_skb) {
-			skb_reserve(sub_skb, 12);
-			skb_put_data(sub_skb, pdata, nSubframe_Length);
-		} else {
-			sub_skb = skb_clone(prframe->pkt, GFP_ATOMIC);
-			if (sub_skb) {
-				sub_skb->data = pdata;
-				sub_skb->len = nSubframe_Length;
-				skb_set_tail_pointer(sub_skb, nSubframe_Length);
-			} else {
-				DBG_88E("skb_clone() Fail!!! , nr_subframes=%d\n", nr_subframes);
+		if (!sub_skb) {
+			DBG_88E("dev_alloc_skb() Fail!!! , nr_subframes=%d\n", nr_subframes);
 			break;
 		}
-		}
+
+		skb_reserve(sub_skb, 12);
+		skb_put_data(sub_skb, pdata, nSubframe_Length);
 
 		subframes[nr_subframes++] = sub_skb;