Improve diagnostics and stability during BUGCHECK#7270

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ilya071294 wants to merge 5 commits intoFirebirdSQL:masterfrom

red-soft-ru:5_0_bugcheck_fixes

Commits on Aug 18, 2022

Print a function name in error messages in cases when a file descriptor is invalid (like it's done in PIO_header) for better diagnostics
ilya071294
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