sound/oss: fix sparse warning: symbol shadows an earlier one

Impact: Move variable to a more inner scope.

Fix this sparse warning:
  sound/oss/sequencer.c:235:29: warning: symbol 'err' shadows an earlier one
  sound/oss/sequencer.c:215:13: originally declared here

Signed-off-by: Hannes Eder <hannes@hanneseder.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

sound/oss/sequencer.c

@@ -212,7 +212,6 @@ int sequencer_write(int dev, struct file *file, const char __user *buf, int coun
 {
 	unsigned char event_rec[EV_SZ], ev_code;
 	int p = 0, c, ev_size;
-	int err;
 	int mode = translate_mode(file);
 
 	dev = dev >> 4;
@@ -285,7 +284,7 @@ int sequencer_write(int dev, struct file *file, const char __user *buf, int coun
 		{
 			if (!midi_opened[event_rec[2]])
 			{
-				int mode;
+				int err, mode;
 				int dev = event_rec[2];
 
 				if (dev >= max_mididev || midi_devs[dev]==NULL)