ALSA: line6: Add yet more sanity checks for invalid EPs

There are a few other places calling usb_submit_urb() with the URB
composed from the fixed endpoint without validation.  For avoiding the
spurious kernel warnings, add the sanity checks to appropriate
places.
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/usb/line6/driver.c

@@ -175,17 +175,24 @@ static int line6_send_raw_message_async_part(struct message *msg,
 	}
 
 	msg->done += bytes;
-	retval = usb_submit_urb(urb, GFP_ATOMIC);
 
-	if (retval < 0) {
-		dev_err(line6->ifcdev, "%s: usb_submit_urb failed (%d)\n",
-			__func__, retval);
-		usb_free_urb(urb);
-		kfree(msg);
-		return retval;
-	}
+	/* sanity checks of EP before actually submitting */
+	retval = usb_urb_ep_type_check(urb);
+	if (retval < 0)
+		goto error;
+
+	retval = usb_submit_urb(urb, GFP_ATOMIC);
+	if (retval < 0)
+		goto error;
 
 	return 0;
+
+ error:
+	dev_err(line6->ifcdev, "%s: usb_submit_urb failed (%d)\n",
+		__func__, retval);
+	usb_free_urb(urb);
+	kfree(msg);
+	return retval;
 }
 
 /*

sound/usb/line6/midi.c

@@ -130,16 +130,21 @@ static int send_midi_async(struct usb_line6 *line6, unsigned char *data,
 			 transfer_buffer, length, midi_sent, line6,
 			 line6->interval);
 	urb->actual_length = 0;
-	retval = usb_submit_urb(urb, GFP_ATOMIC);
+	retval = usb_urb_ep_type_check(urb);
+	if (retval < 0)
+		goto error;
 
-	if (retval < 0) {
-		dev_err(line6->ifcdev, "usb_submit_urb failed\n");
-		usb_free_urb(urb);
-		return retval;
-	}
+	retval = usb_submit_urb(urb, GFP_ATOMIC);
+	if (retval < 0)
+		goto error;
 
 	++line6->line6midi->num_active_send_urbs;
 	return 0;
+
+ error:
+	dev_err(line6->ifcdev, "usb_submit_urb failed\n");
+	usb_free_urb(urb);
+	return retval;
 }
 
 static int line6_midi_output_open(struct snd_rawmidi_substream *substream)