CVS domivogt: * Fixed FvwmButtons crash.

[FVWM CVS]

CVSROOT:        /home/cvs/fvwm
Module name:    fvwm
Changes by:     domivogt        09/02/23 15:08:26

Modified files:
        modules        : ChangeLog 
        modules/FvwmButtons: button.c 

Log message:
* Fixed FvwmButtons crash.