gallium/freedreno: move cast to avoid integer overflow

Previously, the bitshift would be performed on a simple int (32 bits on
most systems), overflow, and then be cast to 64 bits.

CovID: 1362461
Signed-off-by: Eric Engestrom <eric@engestrom.ch>
Signed-off-by: Rob Clark <robdclark@gmail.com>
1 file changed