igt/gem_exec_alignment: Fix off-by-one in evalation of find_last_bit()
igt/gem_exec_alignment: Fix off-by-one in evalation of find_last_bit()

Signed-off-by: Chris Wilson <711c73f64afdce07b7e38039a96d2224209e9a6c@chris-wilson.co.uk>

tiagovignatti/intel-gpu-tools,tiagovignatti/intel-gpu-tools,tiagovignatti/intel-gpu-tools,tiagovignatti/intel-gpu-tools