[HACKERS] Redundant check of em_is_child

In match_eclasses_to_foreign_key_col(), there is this:

            if (em->em_is_child)
                continue;       /* ignore children here */

ISTM, it might as well be:

            Assert(!em->em_is_child);    /* no children yet */

That's because, I think it's still too early in query_planner() to be
expecting any child EC members.

Thanks,
Amit

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