Fix a bug introduced in r. 1.28: when copy{in,out} would fail for an iovec that was not the last one in the uio, the error would be ignored silently.
Fix a bug introduced in r. 1.28: when copy{in,out} would fail for an
iovec that was not the last one in the uio, the error would be ignored
silently.

Bug found and fix proposed by:	jhb

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