staging: rtl8192e: use struct pointer to get the size of the struct

Use pointer to the structure to get the size of the structure in order
to conform to the Linux kernel coding style. Issue found using
checkpatch.

Signed-off-by: Santha Meena Ramamoorthy <santhameena13@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8192e/rtllib_wx.c

@@ -371,8 +371,7 @@ int rtllib_wx_set_encode(struct rtllib_device *ieee,
 		struct lib80211_crypt_data *new_crypt;
 
 		/* take WEP into use */
-		new_crypt = kzalloc(sizeof(struct lib80211_crypt_data),
-				    GFP_KERNEL);
+		new_crypt = kzalloc(sizeof(*new_crypt), GFP_KERNEL);
 		if (new_crypt == NULL)
 			return -ENOMEM;
 		new_crypt->ops = lib80211_get_crypto_ops("R-WEP");