Loop when necessary in contrib/pgcrypto's pktreader_pull().

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

Commit: 4ddd9e72ffaab50aa755f54e5feffc30a0850930
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2014-11-11T22:22:51Z
Releases: 9.1.15
Loop when necessary in contrib/pgcrypto's pktreader_pull().

This fixes a scenario in which pgp_sym_decrypt() failed with "Wrong key
or corrupt data" on messages whose length is 6 less than a power of 2.

Per bug #11905 from Connor Penhale.  Fix by Marko Tiikkaja, regression
test case from Jeff Janes.

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