libxl: fix potential double free in libxlDriverGetDom0MaxmemConf
Commit 4ab0c959 fixed a memory leak in libxlDriverGetDom0MaxmemConf but introduced a potential double free of mem_tokens *** Error in `/usr/sbin/libvirtd': double free or corruption (out): 0x00007fffc808cfd0 *** Avoid double free by setting mem_tokens to NULL after calling virStringListFree.
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