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micro-optimize: removed excess check exist pointer before free()

Herman Semenov requested to merge GermanAizek/xf86-video-sis:remove-excess-check-free into master

@alanc, you can safely delete checks before free, this became possible after C89, code is cleaner.

 C89: 4.10.3.2 The free function.

The free function causes the space pointed to by ptr to be deallocated, that is, made available for further allocation. If ptr is a null pointer, no action occurs.

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