Fix crash with pg_partition_root

Michael Paquier <michael@paquier.xyz>

Commit: 2ab6d28d233af17987ea323e3235b2bda89b4f2e
Author: Michael Paquier <michael@paquier.xyz>
Date: 2019-03-22T08:27:38Z
Releases: 12.0
Fix crash with pg_partition_root

Trying to call the function with the top-most parent of a partition tree
was leading to a crash.  In this case the correct result is to return
the top-most parent itself.

Reported-by: Álvaro Herrera
Author: Michael Paquier
Reviewed-by: Amit Langote
Discussion: https://postgr.es/m/20190322032612.GA323@alvherre.pgsql

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