curl/main_checkfds: check the fcntl return code better #9708
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fcntl() can (in theory) return a non-zero number for success, so a better test for error is checking for -1 explicitly. Follow-up to 41e1b30 Mentioned-by: Dominik Klemba
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fcntl() can (in theory) return a non-zero number for success, so a better test for error is checking for -1 explicitly.
Follow-up to 41e1b30
Mentioned-by: Dominik Klemba