Fix assert in EGLSyncControlTest
Fix assert in EGLSyncControlTest

`ust`, `ust2`, `msc`, and `msc2` are unsigned, so their difference is
still unsigned. The `>0` assert could never fail.
Fix this by simplifying the test to compare the pairs of values directly.

Fixes: 5d9f5df01ac5a384d9b7 ("Implementation of eglGetSyncValuesCHROMIUM extension.")
Fixes: ee218f273f3eb4e14d96 ("Re-land eglGetSyncValuesCHROMIUM extension.")
Signed-off-by: Eric Engestrom <de0b63cf2dfb1fae8ed3c3b4244856a05677d4f0@imgtec.com>
Change-Id: I0b19d786720f545c846640d48c30a83a1d001396
Reviewed-on: https://chromium-review.googlesource.com/500189
Reviewed-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Commit-Queue: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>

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