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Fix another potential file descriptor leak in luaL_loadfile*().

Reported by Peter Cawley.

(cherry picked from commit ab39082fd)

`loadfile()` doesn't close the fd in case when `fopen()` results
successfully, but then the file can't be read (since it is a directory,
for example) or parser failure occurs for some reason.

This patch fixes that behaviour by moving the error formatting after the
cleanup of the descriptor.

Sergey Kaplun:
* added the description and the test for the problem

Part of tarantool/tarantool#11278

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