Errno was not working for errno 7

[unixwzrd]

• Bug in errno.sh errno function number 7, E2BIG failed to parse.
• Simplified logic and dead code when no argument passed.

I suspect that the digit in E2BIG was sone on purpose by someone a long time ago to check parsing of macro processors. It happens to be the only errcode with a digit in it. So the regex was failing on RC=7.

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This discussion was created from the release Errno was not working for errno 7.