line6: fix memory leaks in line6_init_midi()

If the first call to line6_midibuf_init() fails we'll leak a little
bit of memory. If the second call fails we'll leak a bit more. This
happens when we return from the function and the local variable
'line6midi' goes out of scope.
Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/line6/midi.c

@@ -391,12 +391,17 @@ int line6_init_midi(struct usb_line6 *line6)
 		return -ENOMEM;
 
 	err = line6_midibuf_init(&line6midi->midibuf_in, MIDI_BUFFER_SIZE, 0);
-	if (err < 0)
+	if (err < 0) {
+		kfree(line6midi);
 		return err;
+	}
 
 	err = line6_midibuf_init(&line6midi->midibuf_out, MIDI_BUFFER_SIZE, 1);
-	if (err < 0)
+	if (err < 0) {
+		kfree(line6midi->midibuf_in.buf);
+		kfree(line6midi);
 		return err;
+	}
 
 	line6midi->line6 = line6;
 	line6midi->midi_mask_transmit = 1;