[MERGE] Fix another LockableFiles not unlocked warning from test_smart

[Andrew Bennetts]

This change fixes some “LockableFiles ... not explicitly unlocked” warnings from
test_smart.  They were caused by the repository not getting unlocked by the new
streaming fetch verbs when handling errors.

(A related cause is that it's not particularly obvious that a lock_read()
happens on the first iteration of the iterator returned by repo.get_data_stream,
and that the caller is required to do the matching unlock(), but this change
doesn't attempt to address that.)

-Andrew.

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