len was declared unsigned int where we use an int

Fix sparse (-Wtypesign) issues:
drivers/staging/rtl8188eu/core/rtw_ieee80211.c:1081:88: warning:
incorrect type in argument 3 (different signedness)
drivers/staging/rtl8188eu/core/rtw_ieee80211.c:1081:88:    expected int
*len
drivers/staging/rtl8188eu/core/rtw_ieee80211.c:1081:88:    got unsigned
int *<noident>
drivers/staging/rtl8188eu/core/rtw_ieee80211.c:1091:86: warning:
incorrect type in argument 3 (different signedness)
drivers/staging/rtl8188eu/core/rtw_ieee80211.c:1091:86:    expected int
*len
drivers/staging/rtl8188eu/core/rtw_ieee80211.c:1091:86:    got unsigned
int *<noident>

Signed-off-by: Pierre-Yves Kerbrat <pkerb...@free.fr>
---
 drivers/staging/rtl8188eu/core/rtw_ieee80211.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/rtl8188eu/core/rtw_ieee80211.c 
b/drivers/staging/rtl8188eu/core/rtw_ieee80211.c
index b074de5e93f8..d1cd34011602 100644
--- a/drivers/staging/rtl8188eu/core/rtw_ieee80211.c
+++ b/drivers/staging/rtl8188eu/core/rtw_ieee80211.c
@@ -1045,7 +1045,7 @@ void rtw_get_bcn_info(struct wlan_network *pnetwork)
        __le16 le_tmp;
        u16 wpa_len = 0, rsn_len = 0;
        struct HT_info_element *pht_info = NULL;
-       unsigned int            len;
+       int len;
        unsigned char           *p;
 
        memcpy(&le_tmp, rtw_get_capability_from_ie(pnetwork->network.IEs), 2);
-- 
2.11.0

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