Fix size check in statext_dependencies_deserialize()

The check for the minimum expected bytea size of a MVDependencies object
was using SizeOfItem() for its calculation.  This macro uses the number
of attributes in a single dependency.

This minimum size calculation should be based on MinSizeOfItems(), that
computes the minimum expected size as the header plus the
minimally-sized number of dependency items.

Oversight in d08c44f7a4ec.

Author: Ilia Evdokimov <[email protected]>
Discussion: 
https://postgr.es/m/[email protected]
Backpatch-through: 14

Branch
------
REL_15_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/e779f18f32826509aac8ce64d686c03b52d51218

Modified Files
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src/backend/statistics/dependencies.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

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