CVS griph: fix allocation when using FVWM_USERDIR

[FVWM CVS]

CVSROOT:        /home/cvs/fvwm
Module name:    fvwm
Changes by:     griph   06/07/13 02:07:15

Modified files:
        modules        : ChangeLog 
        modules/FvwmCommand: fifos.c 

Log message:
fix allocation when using FVWM_USERDIR