midi fix for envy24control

[Dirk Jagdmann <doj@cubic.org>]

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Hello developers,

I just gave the latest CVS version of envy24control a try and had to add 
this simple patch, so it would not abort upon program start immediately.

-- 
---> doj / cubic
----> http://cubic.org/~doj
-----> http://llg.cubic.org

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? envy24control-midi.diff
Index: midi.c
===================================================================
RCS file: /cvsroot/alsa/alsa-tools/envy24control/midi.c,v
retrieving revision 1.1
diff -u -r1.1 midi.c
--- midi.c	17 Nov 2004 11:41:57 -0000	1.1
+++ midi.c	23 Dec 2004 20:04:59 -0000
@@ -55,6 +55,7 @@
 static void do_controller(int c, int v)
 {
   snd_seq_event_t ev;
+  if(!seq) return;
   snd_seq_ev_clear(&ev);
   snd_seq_ev_set_source(&ev, port);
   snd_seq_ev_set_subs(&ev);