module: extract patient module check into helper

The patient module check inside add_unformed_module() is large
enough as we need it. It is a bit hard to read too, so just
move it to a helper and do the inverse checks first to help
shift the code and make it easier to read. The new helper then
is module_patient_check_exists().

To make this work we need to mvoe the finished_loading() up,
we do that without making any functional changes to that routine.

Reviewed-by: David Hildenbrand <[email protected]>
Signed-off-by: Luis Chamberlain <[email protected]>

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