[HACKERS][PATCH] adding simple sock check for windows

[CharSyam]

Hi, I found some missing check for windows int init_slot function in vacuumdb.c

in windows
SOCKET is unsigned type. so

slot->sock < 0 never can be under 0.

so this patch just check using slot->sock == PGINVALID_SOCKET

Thanks.

simple_check.patch
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