If the mousebutton is unknown when we go to grab, don't just print a warning, but also skip the XGrabButton call. Noticed by code inspection by okan@, but we agreed my fix was cleaner.
If the mousebutton is unknown when we go to grab, don't just print a
warning, but also skip the XGrabButton call. Noticed by code inspection
by okan@, but we agreed my fix was cleaner.

ok okan.

proger/cwm