drm/amd/powerplay: fix Smatch static checker warnings
BugLink: http://bugs.launchpad.net/bugs/1546572 1. return -1 instead of -ENOMEM 2. The struct type mismatch warnings. Signed-off-by: Rex Zhu <Rex.Zhu@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> Reviewed-by: Ken Wang <Qingqing.Wang@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> (cherry picked from commit c15c8d70) Signed-off-by: Alberto Milone <alberto.milone@canonical.com> Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
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