Fix use of free in walsender error handling after a sysid mismatch.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 3a8e9e977fa642433986e5cd145e3a6f86601c2c
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2014-05-06T12:17:41Z
Releases: 9.4.0
Fix use of free in walsender error handling after a sysid mismatch.

Found via valgrind. The bug exists since the introduction of the walsender,
so backpatch to 9.0.

Andres Freund

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