Why use " != "

From: "ipig" <ipig(at)ercist(dot)iscas(dot)ac(dot)cn>
To: <pgsql-hackers(at)postgresql(dot)org>
Subject: Why use " != "
Date: 2006-05-16 02:17:09
Message-ID: 004601c6788e$d7254170$8c01a8c0@homepig
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Hi,

in postgresql-8.1.3/src/backend/storage/lmgr/proc.c
there are 2 function InitProcess and InitDummyProcess, both use
" if (MyProc != NULL)
elog(ERROR, "you already exist"); " (line 215 and 315)

why use " != " ?

Best regards.

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