remove dropbox attribute leak fix

remove dropbox attribute leak fix

change 6ec18461649d3e4f44b2476f886bcc480c456500, avoid leaking stat info,
appears to have side effects on at least macos, crashing the system
coreservicesd. revoke the change until the exact behavior we want is
better understood.

(cherry picked from commit 142883cae8de203822c8be4f975e691b57be2834)

Change-Id: Id3a03e7b3982abb3947c9b3d1baa46c828169cdb
Reviewed-on: http://gerrit.openafs.org/1389
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>