adjust_partition_colnos mustn't be called if not needed

Add an assert to make this very explicit, as well as a code comment.
The former should silence Coverity complaining about this.

Introduced by 7103ebb7aae8.

Reported-by: Ranier Vilela
Discussion: 
https://postgr.es/m/CAEudQAqTTAOzXiYybab+1DQOb3ZUuK99=p_kd+yrrfhcdbd...@mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/183c869e1cbf69e7f5408ccb2121d37deec9956e

Modified Files
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src/backend/executor/execPartition.c | 6 ++++++
1 file changed, 6 insertions(+)

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