Don't rely on uninitialized value in MERGE / DELETE

On MERGE / WHEN MATCHED DELETE it's not possible to get cross-partition
updates, so we don't initialize cpUpdateRetrySlot; however, the code was
not careful to ignore the value in that case.  Make it do so.

Backpatch to 15.

Reported-by: Alexander Lakhin <[email protected]>
Reviewed-by: Dean Rasheed <[email protected]>
Discussion: https://postgr.es/m/[email protected]

Branch
------
REL_15_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/5d8ec1b9f625be800c8db93408e7c0553356fcd3

Modified Files
--------------
src/backend/executor/nodeModifyTable.c | 15 +++++++--------
1 file changed, 7 insertions(+), 8 deletions(-)

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