Plug some (possible) memleaks
PropGetWMClass()
- XAllocClassHint()s a struct for class hint data
- This is filled by XGetClassHint(), which in turn uses Xlib to allocate
some more space for XClassHint members
- Upon XGetClassHint() failure, "default" is libc malloc'd (via strdup),
and is returned to the caller
- Upon XGetClassHint() success, XClassHint members are returned raw --
these members must be freed with XFree() (see XAllocClassHint(3))
- Thus it's up to PropGetWMClass() callers to decide (based upon the return
value) which method (libc free() or XFree()) to use to free res_name
and res_class. This was done nowhere, thus leaking some memory
on every failed PropGetWMClass() call.
- So just strdup the successful res_name/res_class members, XFree() them
while still in PropGetWMClass(), and allow callers to unconditionally
libc free() whatever PropGetWMClass() returns.