ALSA: ppc: fix unused function local variable

The function local variable is not used anymore, while it is left.

This commit deletes it.

Fixes: 25a5a77ae0 ("ALSA: core: Make snd_card_free() return void")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Link: https://lore.kernel.org/r/20230209104823.45899e76@canb.auug.org.au/
Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Link: https://lore.kernel.org/r/20230209002548.94496-1-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/ppc/snd_ps3.c

@@ -1046,7 +1046,6 @@ clean_open:
 /* called when module removal */
 static void snd_ps3_driver_remove(struct ps3_system_bus_device *dev)
 {
-	int ret;
 	pr_info("%s:start id=%d\n", __func__,  dev->match_id);
 
 	/*