HID: thrustmaster: fix memory leak in thrustmaster_interrupts()

In thrustmaster_interrupts(), the allocated send_buf is not
freed if the usb_check_int_endpoints() check fails, leading
to a memory leak.

Fix this by ensuring send_buf is freed before returning in
the error path.

Fixes: 50420d7c79 ("HID: hid-thrustmaster: Fix warning in thrustmaster_probe by adding endpoint check")
Signed-off-by: Qasim Ijaz <qasdev00@gmail.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>

drivers/hid/hid-thrustmaster.c

@@ -174,6 +174,7 @@ static void thrustmaster_interrupts(struct hid_device *hdev)
 	u8 ep_addr[2] = {b_ep, 0};
 
 	if (!usb_check_int_endpoints(usbif, ep_addr)) {
+		kfree(send_buf);
 		hid_err(hdev, "Unexpected non-int endpoint\n");
 		return;
 	}