[CM] snd infinite recursion

[Bill Schottstaedt]

> i also have a big trouble with filter drawing in the controls panel, 
> when you put one point right under another one so the line goes sreight 
> vertical ..it goes into infinite loop too ! 

I can't get this to happen.  Could you run Snd in gdb, get it to hang, type
C-C, then "where" to gdb, and send me the stacktrace?  Also, send
whatever ./snd --version prints out, so I have some better idea
where to look.