XkbFreeGeomColors - Man Page
Free geometry colors
void XkbFreeGeomColors (XkbGeometryPtr geom, int first, int count, Bool free_all);
geometry in which colors should be freed
first color to be freed
number of colors to be freed
True => all colors are freed
Xkb provides a number of functions to allocate and free subcomponents of a keyboard geometry. Use these functions to create or modify keyboard geometries. Note that these functions merely allocate space for the new element(s), and it is up to you to fill in the values explicitly in your code. These allocation functions increase sz_* but never touch num_* (unless there is an allocation failure, in which case they reset both sz_* and num_* to zero). These functions return Success if they succeed, BadAlloc if they are not able to allocate space, or BadValue if a parameter is not as expected.
If free_all is True, all colors are freed regardless of the value of first or count. Otherwise, count colors are freed beginning with the one specified by first.
Unable to allocate storage
An argument is out of range