Protect from null param on ecpg disconnect, verified by Roland Karch

Bruce Momjian <bruce@momjian.us>

Commit: 88d639e6e8f5219d93a60552a25df83b8fed9d06
Author: Bruce Momjian <bruce@momjian.us>
Date: 2002-12-13T20:29:07Z
Releases: 7.4.1
Protect from null param on ecpg disconnect, verified by Roland Karch

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src/interfaces/ecpg/preproc/preproc.y modified +85 −84