staging: rtl8723au: Remove redundant casting in rtw_mlme.c

Casting value returned by kzalloc is useless.
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8723au/core/rtw_mlme.c

@@ -1820,7 +1820,7 @@ int rtw_set_auth23a(struct rtw_adapter * adapter,
 	struct cmd_priv *pcmdpriv = &adapter->cmdpriv;
 	int res = _SUCCESS;
 
-	pcmd = (struct cmd_obj *)kzalloc(sizeof(struct cmd_obj), GFP_KERNEL);
+	pcmd = kzalloc(sizeof(struct cmd_obj), GFP_KERNEL);
 	if (!pcmd) {
 		res = _FAIL;  /* try again */
 		goto exit;