staging: rtl8188eu: fix spelling mistake "transfoer_len" -> "transfer_len"

Trivial fix to spelling mistake in DBG_88E debug message text.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/os_dep/usb_ops_linux.c

@@ -84,7 +84,7 @@ static int recvbuf2recvframe(struct adapter *adapt, struct sk_buff *pskb)
 
 		if ((pattrib->pkt_len <= 0) || (pkt_offset > transfer_len)) {
 			RT_TRACE(_module_rtl871x_recv_c_, _drv_info_, ("recvbuf2recvframe: pkt_len<=0\n"));
-			DBG_88E("%s()-%d: RX Warning!,pkt_len<=0 or pkt_offset> transfoer_len\n", __func__, __LINE__);
+			DBG_88E("%s()-%d: RX Warning!,pkt_len<=0 or pkt_offset> transfer_len\n", __func__, __LINE__);
 			rtw_free_recvframe(precvframe, pfree_recv_queue);
 			goto _exit_recvbuf2recvframe;
 		}