Make sure that arraysz is initialized to a value larger than zero. arraysz could get initialized to zero on ZFS because ZFS reports directory sizes differently compared to UFS.
Make sure that arraysz is initialized to a value larger than zero.
arraysz could get initialized to zero on ZFS because ZFS reports
directory sizes differently compared to UFS.

PR:		bin/169493
Tested by:	swills
MFC after:	2 weeks

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