staging: greybus: audio: fix error message for BTN_3 button

In gbaudio_init_jack(), when setting SND_JACK_BTN_3 key, the error
message incorrectly says "Failed to set BTN_0". This should be
"Failed to set BTN_3" to match the button being configured.

Signed-off-by: Haoyu Lu <hechushiguitu666@gmail.com>
Reviewed-by: Johan Hovold <johan@kernel.org>
Link: https://patch.msgid.link/20260330083425.266-1-hechushiguitu666@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: Haoyu Lu

drivers/staging/greybus/audio_codec.c

@@ -781,7 +781,7 @@ static int gbaudio_init_jack(struct gbaudio_module_info *module,
 		ret = snd_jack_set_key(module->button.jack.jack, SND_JACK_BTN_3,
 				       KEY_VOLUMEDOWN);
 		if (ret) {
-			dev_err(module->dev, "Failed to set BTN_0\n");
+			dev_err(module->dev, "Failed to set BTN_3\n");
 			goto free_jacks;
 		}
 	}