src.ctf.fs: remove goto error handling from data-stream-file.cpp

src.ctf.fs: remove goto error handling from data-stream-file.cpp

Same as previous patch, but for data-stream-file.cpp.

Change-Id: Ieb52faca6142ff33591fce2d880bcde664f2c1b7
Signed-off-by: Simon Marchi <simon.marchi@efficios.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/8320
Reviewed-by: Philippe Proulx <eeppeliteloop@gmail.com>
Reviewed-on: https://review.lttng.org/c/babeltrace/+/12340
Tested-by: jenkins <jenkins@lttng.org>