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select: simplify return code handling for poll and select #5880

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@mback2k mback2k commented Aug 28, 2020

poll and select already return -1 on error according to POSIX,
so there is no need to perform a <0 to -1 conversion in code.

Also we can just use one check with <= 0 on the return code.

Assisted-by: Daniel Stenberg

Replaces #5852

poll and select already return -1 on error according to POSIX,
so there is no need to perform a <0 to -1 conversion in code.

Also we can just use one check with <= 0 on the return code.

Assisted-by: Daniel Stenberg

Replaces #5852
@mback2k mback2k added the tidy-up label Aug 28, 2020
@mback2k mback2k requested a review from bagder Aug 28, 2020
@mback2k mback2k self-assigned this Aug 28, 2020
@jay
jay approved these changes Aug 29, 2020
@mback2k mback2k closed this in 05729b6 Aug 29, 2020
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