staging: bcm2835-audio: fix memory leak in bcm2835_audio_open_connection()

In bcm2835_audio_open_connection(), if VCHI connection fails or
initialisation of VCHI audio instance fails vchi_instance needs to be
deallocated otherwise it will cause a memory leak.
Signed-off-by: Aishwarya Pant <aishpant@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vc04_services/bcm2835-audio/bcm2835-vchiq.c

@@ -446,6 +446,7 @@ static int bcm2835_audio_open_connection(struct bcm2835_alsa_stream *alsa_stream
 	LOG_DBG(" success !\n");
 	ret = 0;
 err_free_mem:
+	kfree(vchi_instance);
 	LOG_DBG(" .. OUT\n");
 
 	return ret;