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

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: a7a3e71c8592a530f9a605aea4f08af7ad8e0ab3
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2014-05-06T12:16:51Z
Releases: 9.3.5
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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