tests: Make CHECK enforce 1 instead of just "!= 0" #1481
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This ensures that we don't omit the "== 1" in tests accidentally,
and thus also strengthens existing tests in which it has been omitted.
We want to check "== 1" in particular for the return values of API
functions, but it also makes sense in the case of internal functions.
If you really want to check "!= 0", you can still write it explicitly.
The second commit drops all the redundant "== 1"s. I tried to be careful to drop it only where it makes sense. Now,
git grep "== 1"
shows only instances where the 1 is supposed to be an actual integer and not a boolean. Still, this touches many lines, so I can drop this commit if you think it's too intrusive.