1) remove useless check of loop_copy - corresponding code was removed in    rev. 1.70 five years ago. 2) convert loop_copy to "non-negative" flag
1) remove useless check of loop_copy - corresponding code was removed in
   rev. 1.70 five years ago.
2) convert loop_copy to "non-negative" flag

Approved by:	glebius (mentor)
MFC after:	2 weeks

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