staging: rtl8188eu: fix sparse signedness warnings in rtw_generate_ie

Changed the type of wpa_ie_len from (int *) to (unsigned int *) in the
function rtw_get_wpa_ie(..) to suppress signedness mismatch warnings in
rtw_generate_ie of the type-

drivers/staging/rtl8188eu//core/rtw_ieee80211.c:1009:60: warning: incorrect
type in argument 2 (different signedness)
drivers/staging/rtl8188eu//core/rtw_ieee80211.c:1009:60:    expected int
*wpa_ie_len
drivers/staging/rtl8188eu//core/rtw_ieee80211.c:1009:60:    got unsigned
int *<noident>

Signed-off-by: Aishwarya Pant <aishpant@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/core/rtw_ieee80211.c

@@ -292,7 +292,7 @@ int rtw_generate_ie(struct registry_priv *pregistrypriv)
 	return sz;
 }
 
-unsigned char *rtw_get_wpa_ie(unsigned char *pie, int *wpa_ie_len, int limit)
+unsigned char *rtw_get_wpa_ie(unsigned char *pie, uint *wpa_ie_len, int limit)
 {
 	uint len;
 	u16 val16;

drivers/staging/rtl8188eu/include/ieee80211.h

@@ -861,7 +861,7 @@ u8 *rtw_get_ie(u8 *pbuf, int index, uint *len, int limit);
 
 void rtw_set_supported_rate(u8 *SupportedRates, uint mode);
 
-unsigned char *rtw_get_wpa_ie(unsigned char *pie, int *wpa_ie_len, int limit);
+unsigned char *rtw_get_wpa_ie(unsigned char *pie, uint *wpa_ie_len, int limit);
 unsigned char *rtw_get_wpa2_ie(unsigned char *pie, uint *rsn_ie_len, int limit);
 int rtw_get_wpa_cipher_suite(u8 *s);
 int rtw_get_wpa2_cipher_suite(u8 *s);