staging:r8188eu: Remove struct pkt_file from rtw_xmitframe_coalesce()

Struct pkt_file is a base to simple wrapper for skb_copy_bits().
Eliminate struct pkt_file usage in rtw_xmitframe_coalesce().
Signed-off-by: Ivan Safonov <insafonov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/core/rtw_xmit.c

@@ -943,7 +943,6 @@ This sub-routine will perform all the following:
 */
 s32 rtw_xmitframe_coalesce(struct adapter *padapter, struct sk_buff *pkt, struct xmit_frame *pxmitframe)
 {
-	struct pkt_file pktfile;
 	s32 frg_inx, frg_len, mpdu_len, llc_sz, mem_sz;
 	size_t addr;
 	u8 *pframe, *mem_start;
@@ -954,7 +953,7 @@ s32 rtw_xmitframe_coalesce(struct adapter *padapter, struct sk_buff *pkt, struct
 	u8 *pbuf_start;
 	s32 bmcst = IS_MCAST(pattrib->ra);
 	s32 res = _SUCCESS;
-
+	size_t remainder = pkt->len - ETH_HLEN;
 
 	psta = rtw_get_stainfo(&padapter->stapriv, pattrib->ra);
 
@@ -979,9 +978,6 @@ s32 rtw_xmitframe_coalesce(struct adapter *padapter, struct sk_buff *pkt, struct
 		goto exit;
 	}
 
-	_rtw_open_pktfile(pkt, &pktfile);
-	_rtw_pktfile_read(&pktfile, NULL, ETH_HLEN);
-
 	frg_inx = 0;
 	frg_len = pxmitpriv->frag_len - 4;/* 2346-4 = 2342 */
 
@@ -1038,12 +1034,9 @@ s32 rtw_xmitframe_coalesce(struct adapter *padapter, struct sk_buff *pkt, struct
 		if ((pattrib->icv_len > 0) && (pattrib->bswenc))
 			mpdu_len -= pattrib->icv_len;
 
-		if (bmcst) {
-			/*  don't do fragment to broadcat/multicast packets */
-			mem_sz = _rtw_pktfile_read(&pktfile, pframe, pattrib->pktlen);
-		} else {
-			mem_sz = _rtw_pktfile_read(&pktfile, pframe, mpdu_len);
-		}
+		mem_sz = min_t(size_t, bmcst ? pattrib->pktlen : mpdu_len, remainder);
+		skb_copy_bits(pkt, pkt->len - remainder, pframe, mem_sz);
+		remainder -= mem_sz;
 
 		pframe += mem_sz;
 
@@ -1054,7 +1047,7 @@ s32 rtw_xmitframe_coalesce(struct adapter *padapter, struct sk_buff *pkt, struct
 
 		frg_inx++;
 
-		if (bmcst || pktfile.pkt_len == 0) {
+		if (bmcst || remainder == 0) {
 			pattrib->nr_frags = frg_inx;
 
 			pattrib->last_txcmdsz = pattrib->hdrlen + pattrib->iv_len + ((pattrib->nr_frags == 1) ? llc_sz : 0) +