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modules: check gl.modules before iterates on it when freeing

In some circumstances, as described in the BZ, can happen that
free_modules_when_no_refs_unlocked() is called multiple times
when the module destructor is invoked.
We should check gl.modules before iterates on it in the
free_modules_when_no_refs_unlocked() functions, to avoid
a SIGSEGV.

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1680963

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