staging: goldfish: Call free_irq in error path

If misc_register failed in goldfish_audio_probe, the already requested
IRQ wouldn't get freed. Add a call to free_irq() like there is in
goldfish_audio_remove().
Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/goldfish/goldfish_audio.c

@@ -334,6 +334,7 @@ static int goldfish_audio_probe(struct platform_device *pdev)
 	return 0;
 
 err_misc_register_failed:
+	free_irq(data->irq, data);
 err_request_irq_failed:
 	dma_free_coherent(&pdev->dev, COMBINED_BUFFER_SIZE,
 					data->buffer_virt, data->buffer_phys);