Staging: rtl8192su: fix build warnings

This fixes some build warnings in the rtl8192su driver.
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/rtl8192su/ieee80211/ieee80211_wx.c

@@ -731,7 +731,7 @@ int ieee80211_wx_set_encode_ext(struct ieee80211_device *ieee,
 
 	 ops = ieee80211_get_crypto_ops(alg);
         if (ops == NULL) {
-                request_module(module);
+                request_module("%s", module);
                 ops = ieee80211_get_crypto_ops(alg);
         }
         if (ops == NULL) {