[media] drivers/media/video: fix memory leak of snd_cx18_init()

cxsc is not freed in the error case.

Signed-off-by: Andre Bartke <[e-mail]>
Cc: Andy Walls <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>

drivers/media/video/cx18/cx18-alsa-main.c

···
 err_exit_free:
 	if (sc != NULL)
 		snd_card_free(sc);
+	kfree(cxsc);
 err_exit:
 	return ret;
 }