st/mesa: avoid integer overflows with buffers >= 512MB
This fixes failures with the newly-submitted max-size texture buffer piglit test for GPUs exposing >= 128M max texels. Signed-off-by:Ilia Mirkin <imirkin@alum.mit.edu> Cc: "10.6 11.0" <mesa-stable@lists.freedesktop.org> Reviewed-by:
Glenn Kennard <glenn.kennard@gmail.com>
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