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vrend: Read only as many bytes as were mapped

Gert Wollny requested to merge gerddie/virglrenderer:fix-oob-buffer-readback into main

The width given in glMapBufferRange refers to machine units, i.e. the format of the underlying buffer is of no consequence. Hence only info->box->width bytes are mapped and can be copied to the IOV.

In guest mesa this is accounted for so we don't have to calculate the send_size value.

Closes: https://gitlab.freedesktop.org/virgl/virglrenderer/-/issues/469

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