usb: hub: Simplify error and success path in port_over_current_notify

kasprintf() returns NULL or valid pointer. Since kfree() can handle
NULL pointer condition, simplify error and success paths in function
port_over_current_notify() by removing multiple error path labels.
Signed-off-by: NBhuvanesh Surachari <Bhuvanesh_Surachari@mentor.com>
Signed-off-by: NEugeniu Rosca <erosca@de.adit-jv.com>
Link: https://lore.kernel.org/r/1652369834-4480-1-git-send-email-erosca@de.adit-jv.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/core/hub.c

@@ -5511,7 +5511,7 @@ static void hub_port_connect_change(struct usb_hub *hub, int port1,
 /* Handle notifying userspace about hub over-current events */
 static void port_over_current_notify(struct usb_port *port_dev)
 {
-	char *envp[3];
+	char *envp[3] = { NULL, NULL, NULL };
 	struct device *hub_dev;
 	char *port_dev_path;
 
@@ -5528,20 +5528,18 @@ static void port_over_current_notify(struct usb_port *port_dev)
 
 	envp[0] = kasprintf(GFP_KERNEL, "OVER_CURRENT_PORT=%s", port_dev_path);
 	if (!envp[0])
-		goto exit_path;
+		goto exit;
 
 	envp[1] = kasprintf(GFP_KERNEL, "OVER_CURRENT_COUNT=%u",
 			port_dev->over_current_count);
 	if (!envp[1])
 		goto exit;
 
-	envp[2] = NULL;
 	kobject_uevent_env(&hub_dev->kobj, KOBJ_CHANGE, envp);
 
-	kfree(envp[1]);
 exit:
+	kfree(envp[1]);
 	kfree(envp[0]);
-exit_path:
 	kfree(port_dev_path);
 }