%prun: Restore `stats.stream` after running `print_stream`....
%prun: Restore `stats.stream` after running `print_stream`.
When profiling, the output from `print_stream` is captured so that the
output can be paged. To do so, the `stream` attribute is set to a
`StringIO` object but was not restored after the output was captured.
As a result, the stats object returned by `%prun -r` did not display
any output when calling its `print_stream` method.
In addition, the `pstats.Stats` class has the `stream` attribute for
all currently supported Python versions, so the extra branch of code
can be removed.
