Fix incorrect posix_spawn* error checking #2513
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The posix_spawn functions do not use `-1` as the sentinel for errors, rather `0` is return on success and every other return value is an error. Adds a test case to test posix_spawn failure.
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The posix_spawn functions do not use
-1as the sentinel for errors,rather
0is return on success and every other return value is anerror.
Adds a test case to test posix_spawn failure.
Checklist:
CONTRIBUTING.md