Fix overflow at return wchar2char (src/backend/utils/adt/pg_locale.c)

[Ranier Vilela]

Hi,

1. wchar2char has a mistake when checking the return of WideCharToMultiByte
call.
result variable is unsigned, therefore, cannot be less than zero, returning
-1 is not an option.

2. strftime or strftime_win32, return cannot be less than zero.

3. If strftime or strftime_win32, fails, why not abort the loop?

regards,
Ranier Vilela

v1-0001-fix_overflow_wchar2char.patch
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