25817b0854097a6a93e8cf066c83f30d65ed6656
fixes an assert() firing when starting X. thanks to the report by pikpik. . NO_MEM was 0, which is actually an existing piece of physical memory. it can't be allocated because it's reserved for bios data (by the kernel), but it can be mapped in (e.g. by X), causing sanity check disaster. . NONCONTIGUOUS is also obsolete as all allocations are single-page now, i.e. NONCONTIGUOUS is really the default and only mode.
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