llvmpipe: Fix zero-division in llvmpipe_texture_layout()
llvmpipe: Fix zero-division in llvmpipe_texture_layout()

Fix the crash of "gnome-control-center info" invocation on QEMU where
zero height is passed at init.

(sroland: simplify logic by eliminating the div altogether, using 64bit mul.)

Fixes: https://bugzilla.novell.com/show_bug.cgi?id=879462

Cc: "10.2" <59f39c0db42d4479a46b02d4d2bc11120e37bb44@lists.freedesktop.org>

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