r600: Fix size calculation for 24 bit depth
r600: Fix size calculation for 24 bit depth

size was being calculated based on 3 bytes per pixel with 24 bit depth
instead of 4 bytes.  This caused corruption in the bottom 25% of objects.
This finishes fixing the menu/text corruption in compiz/kde4.

Signed-off-by: Robert Noland <e2ca747409018c6028240e8cecb1688df0451e4c@2hip.net>

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