tools/rv: Fix cleanup after failed trace setup

tools/rv: Fix cleanup after failed trace setup

Currently if ikm_setup_trace_instance() fails, the tool returns without
any cleanup, if rv was called with both -t and -r, this means the
reactor is not going to be cleared.

Jump to the cleanup label to restore the reactor if necessary.

Fixes: 6d60f89691fc9 ("tools/rv: Add in-kernel monitor interface")
Reviewed-by: Nam Cao <namcao@linutronix.de>
Link: https://lore.kernel.org/r/20260514152055.229162-5-gmonaco@redhat.com
Signed-off-by: Gabriele Monaco <gmonaco@redhat.com>