The test meant to use the saved value of errno. Given the current code, it
makes no practical difference however.

Fixes: bf598a8f ("bpftool: Improve handling of ENOENT on map dumps")
Signed-off-by: NBenjamin Poirier <bpoirier@suse.com>
Reviewed-by: NQuentin Monnet <quentin.monnet@netronome.com>
Acked-by: NSong Liu <songliubraving@fb.com>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
Signed-off-by: NAlexei Starovoitov <ast@kernel.org>