staging rtl8188eu: add a blank line after declarations

fix a coding style issue: Missing a blank line after declarations
Signed-off-by: huanqi chi <chihuanqi@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/core/rtw_br_ext.c

@@ -442,6 +442,7 @@ static void __nat25_db_print(struct adapter *priv)
 void nat25_db_cleanup(struct adapter *priv)
 {
 	int i;
+
 	spin_lock_bh(&priv->br_ext_lock);
 
 	for (i = 0; i < NAT25_HASH_SIZE; i++) {