[RFC] algol68: Remove redundant HAS_ROWS check from caller side of a68_low_dup

[Kanishka Solanki]

Hi,

As discussed on the mailing list, I worked on the task of removing
redundant HAS_ROWS checks before calls to a68_low_dup.

This patch removes two caller-side HAS_ROWS checks that are no longer
necessary, since a68_low_dup now handles the HAS_ROWS case internally.

Tested with:
make check-algol68

This is my first GCC patch, so feedback is very welcome.

Thanks,
Kanishka Solanki
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