tests: skip when large buf register fails

Registering lots of memory will fail for non-privileged users, so skip
tests if that happens.

Signed-off-by: Pavel Begunkov <[email protected]>
Link: https://lore.kernel.org/r/682c09c1d153cd4dfe505ded6069b294e98078e3.1629913874.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <[email protected]>
4 files changed