ALSA: pcmcia: Fix resource leak in snd_pdacf_probe error path

When pdacf_config() fails, snd_pdacf_probe() returns the error code
directly without freeing the sound card resources allocated by
snd_card_new(), which leads to a memory leak.

Add proper error handling to free the sound card and clear the card
list entry when pdacf_config() fails.

Fixes: 15b99ac17295 ("[PATCH] pcmcia: add return value to _config() functions")
Suggested-by: Takashi Iwai <[e-mail]>
Signed-off-by: Haotian Zhang <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Takashi Iwai <[e-mail]>

sound/pcmcia/pdaudiocf/pdaudiocf.c

···
 	link->config_index = 1;
 	link->config_regs = PRESENT_OPTION;
 
-	return pdacf_config(link);
+	err = pdacf_config(link);
+	if (err < 0) {
+		card_list[i] = NULL;
+		snd_card_free(card);
+		return err;
+	}
+	return 0;
 }