wireless: purelifi: plfxlc: fix memory leak in plfxlc_usb_wreq_asyn()

Add usb_free_urb() in the error path to prevent memory leak.

Signed-off-by: Salah Triki <[email protected]>
Link: https://patch.msgid.link/aA3_maPlEJzO7wrL@pc
[fix subject]
Signed-off-by: Johannes Berg <[email protected]>

Author: salah-triki

drivers/net/wireless/purelifi/plfxlc/usb.c

@@ -503,8 +503,10 @@ int plfxlc_usb_wreq_async(struct plfxlc_usb *usb, const u8 *buffer,
 			  (void *)buffer, buffer_len, complete_fn, context);
 
 	r = usb_submit_urb(urb, GFP_ATOMIC);
-	if (r)
+	if (r) {
+		usb_free_urb(urb);
 		dev_err(&udev->dev, "Async write submit failed (%d)\n", r);
+	}
 
 	return r;
 }