up: Notice errors on both file handles

Report errors on both filehandles in up's Copy routine, rather
than just on the second one that we close.

Caught by clang-analyzer

Change-Id: Ia3aa9be91ccfca2993a4f27c291332e0b0d350f5
Reviewed-on: http://gerrit.openafs.org/9192
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>