[ALSA] mpu-401: remove MPU401_INFO_UART_ONLY flag

Since the last patch made the ENTER_UART command optional, the
enter_uart option and its corresponding flag have become superfluous.
The uart_enter option remains for backward compatibility but just prints
a warning when used.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/sound/drivers/mpu401/mpu401.c b/sound/drivers/mpu401/mpu401.c
index 67c6e97..23fee62 100644
--- a/sound/drivers/mpu401/mpu401.c
+++ b/sound/drivers/mpu401/mpu401.c
@@ -70,6 +70,9 @@
 	struct snd_card *card;
 	int err;
 
+	if (!uart_enter[dev])
+		snd_printk(KERN_ERR "the uart_enter option is obsolete; remove it\n");
+
 	*rcard = NULL;
 	card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);
 	if (card == NULL)
@@ -83,8 +86,7 @@
 		strcat(card->longname, "polled");
 	}
 
-	err = snd_mpu401_uart_new(card, 0, MPU401_HW_MPU401, port[dev],
-				  uart_enter[dev] ? 0 : MPU401_INFO_UART_ONLY,
+	err = snd_mpu401_uart_new(card, 0, MPU401_HW_MPU401, port[dev], 0,
 				  irq[dev], irq[dev] >= 0 ? IRQF_DISABLED : 0,
 				  NULL);
 	if (err < 0) {