[ALSA] Fix memory leak

ALSA sequencer
Fixed memory leak by the last change of stack reduction.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/core/seq/seq_midi.c b/sound/core/seq/seq_midi.c
index 18247db..57be915 100644
--- a/sound/core/seq/seq_midi.c
+++ b/sound/core/seq/seq_midi.c
@@ -414,6 +414,8 @@
 	if (newclient)
 		synths[card->number] = client;
 	up(&register_mutex);
+	kfree(info);
+	kfree(port);
 	return 0;	/* success */
 
       __nomem: