staging: wfx: fix an error handling in wfx_init_common()

One error handler of wfx_init_common() return without calling
ieee80211_free_hw(hw), which may result in memory leak. And I add
one err label to unify the error handler, which is useful for the
subsequent changes.
Suggested-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Signed-off-by: Xiaoke Wang <xkernel.wang@foxmail.com>
Link: https://lore.kernel.org/r/tencent_24A24A3EFF61206ECCC4B94B1C5C1454E108@qq.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wfx/main.c

@@ -305,7 +305,8 @@ struct wfx_dev *wfx_init_common(struct device *dev, const struct wfx_platform_da
 	of_property_read_string(dev->of_node, "silabs,antenna-config-file", &wdev->pdata.file_pds);
 	wdev->pdata.gpio_wakeup = devm_gpiod_get_optional(dev, "wakeup", GPIOD_OUT_LOW);
 	if (IS_ERR(wdev->pdata.gpio_wakeup))
-		return NULL;
+		goto err;
+
 	if (wdev->pdata.gpio_wakeup)
 		gpiod_set_consumer_name(wdev->pdata.gpio_wakeup, "wfx wakeup");
 
@@ -322,6 +323,10 @@ struct wfx_dev *wfx_init_common(struct device *dev, const struct wfx_platform_da
 		return NULL;
 
 	return wdev;
+
+err:
+	ieee80211_free_hw(hw);
+	return NULL;
 }
 
 int wfx_probe(struct wfx_dev *wdev)