om2k: Fix invalid use of linked list when building hopping freq list

I originally assumed that after a complete scan with llist_for_each_entry
the loop counter would be either NULL or a valid entry. That's just not
the case.

Fixes: CID#210256

Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
Change-Id: Iad647b74771c4ac406a88effd371ed7748c8847e
1 file changed