[HACKERS] Why use " != "

Mon, 15 May 2006 19:18:03 -0700

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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