Remove the additional paranoia that I added compared to upstream

(reading back the relocation).

It doesn't add any real security and when we actually need to map the
buffer on demand to read/write it makes things cripplingly slow. The
correct way to make this utterly incorruptible is a radeon-kms-like
command checker to the command streams. This is on my todo list.

Thanks to drahn@ for additional testing.

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