- Use LK_TYPE_MASK where needed. Actually after sys/sys/lockmgr.h:1.69 it is   no longer needed, but for now we still want to be consistent with other   similar checks in the tree. - Call ASSERT_VOP_ELOCKED() only when vget() returns 0.
- Use LK_TYPE_MASK where needed. Actually after sys/sys/lockmgr.h:1.69 it is
  no longer needed, but for now we still want to be consistent with other
  similar checks in the tree.
- Call ASSERT_VOP_ELOCKED() only when vget() returns 0.

Reviewed by:	jeff

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