tdfx: Handle errors from copyin() and copyout()
This is in preparation for annotating copyin() and related functions
with __result_use_check.
MFC after: 1 week
(cherry picked from commit 2873d841f81cdc205135370875d3d71a3402e90a)
tdfx: Handle errors from copyin() and copyout() Tags None Referenced Files None Subscribers None
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