ALSA: portman2x4: fix NULL pointer dereference

While registering pardev, the irq_func was also registered. As a result
when we tried to probe for the card, an interrupt was generated and in
the ISR we tried to dereference private_data. But private_data is still
NULL as we have not yet done portman_create(). Lets probe for the device
after card is created.

Fixes: e6a1b7e ("ALSA: portman2x4 - use new parport device model")
Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/drivers/portman2x4.c

@@ -762,18 +762,19 @@ static int snd_portman_probe(struct platform_device *pdev)
 		err = -EIO;
 		goto free_pardev;
 	}
-	err = portman_probe(p);
-	if (err) {
-		err = -EIO;
-		goto release_pardev;
-	}
 
 	if ((err = portman_create(card, pardev, &pm)) < 0) {
 		snd_printd("Cannot create main component\n");
 		goto release_pardev;
 	}
 	card->private_data = pm;
 	card->private_free = snd_portman_card_private_free;
+
+	err = portman_probe(p);
+	if (err) {
+		err = -EIO;
+		goto __err;
+	}
 
 	if ((err = snd_portman_rawmidi_create(card)) < 0) {
 		snd_printd("Creating Rawmidi component failed\n");