MFV r261619:

4574 get_clones_stat does not call zap_count in non-debug kernel

zap_count(...) is never called in non-DEBUG kernel.
As result "count" variable is always 0, and "goto fail" is always
reached.  This means get_clones_stat function never makes up list
of clones for "clones" properties.

MFC after:	2 weeks

(cherry picked from commit 1dfe96a0666d48596f1932917c8135ad1f3c69c7)