staging: r8188eu: Fix sparse warning in core/rtw_xmit.c

Sparse reports the following warning:

  CHECK   drivers/staging/rtl8188eu/core/rtw_xmit.c
drivers/staging/rtl8188eu/core/rtw_xmit.c:809:23: warning: incorrect type in initializer (different base types)
drivers/staging/rtl8188eu/core/rtw_xmit.c:809:23:    expected unsigned short [usertype] *fctrl
drivers/staging/rtl8188eu/core/rtw_xmit.c:809:23:    got restricted __le16 *<noident>
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/core/rtw_xmit.c

@@ -806,7 +806,7 @@ s32 rtw_make_wlanhdr (struct adapter *padapter , u8 *hdr, struct pkt_attrib *pat
 	u8 qos_option = false;
 
 	int res = _SUCCESS;
-	u16 *fctrl = &pwlanhdr->frame_ctl;
+	__le16 *fctrl = &pwlanhdr->frame_ctl;
 
 	struct sta_info *psta;