plugin/amdgpu: Also don't print 'plugin failed' in criu #2343
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We already don't treat it as error in the plugin itself, but after returning -1 from RESUME_DEVICES_LATE hook we print debug message in criu about failed plugin, let's return 0 instead.
While on it let's replace ret to exit_code.
Fixes: a9cbdad ("plugin/amdgpu: Don't print error for "No such process" during resume")