Suppress compiler warning in libpq_pipeline.c.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 522d1a89f8d7ed45681988c60bd0a687332a4023
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2021-03-31T19:30:04Z
Releases: 14.0
Suppress compiler warning in libpq_pipeline.c.

Some compilers seem to be concerned about the possibility that
recv_step is not any of the defined enum values.  Silence
warnings about uninitialized cmdtag in a different way than
I did in 9fb9691a8.

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