tests/kms_flip: Unconfuse the framenumber step checking
tests/kms_flip: Unconfuse the framenumber step checking

We run flips and vblank waits in parallel, which means the step
for each is the maximum. If we'd switch to an interleaved scheme
(to be able to check the correlation) we'd need to add them instead.

Signed-off-by: Daniel Vetter <c1b6782c4af8f0673da8923a0702a1832e5940f4@ffwll.ch>

chenxianqin/intel-gpu-tools,rib/intel-gpu-tools,yipdw/intel-gpu-tools,erikarn/intel-gpu-tools,mv0/intel-gpu-tools,dlespiau/checkmate-test-igt,tiagovignatti/intel-gpu-tools,yipdw/intel-gpu-tools,erikarn/intel-gpu-tools,erikarn/intel-gpu-tools,yipdw/intel-gpu-tools,mv0/intel-gpu-tools,yipdw/intel-gpu-tools,tiagovignatti/intel-gpu-tools,erikarn/intel-gpu-tools,dlespiau/checkmate-test-igt,chenxianqin/intel-gpu-tools,dlespiau/checkmate-test-igt,rib/intel-gpu-tools,mv0/intel-gpu-tools,tiagovignatti/intel-gpu-tools,chenxianqin/intel-gpu-tools,tiagovignatti/intel-gpu-tools,dlespiau/checkmate-test-igt,chenxianqin/intel-gpu-tools,rib/intel-gpu-tools,rib/intel-gpu-tools,mv0/intel-gpu-tools