drm/amd/powerplay: avoid NULL pointer dereference
if (a == NULL || a->b == NULL) leads to a NULL pointer dereference if a == NULL. Reviewed-by: NChristian König <christian.koenig@amd.com> Signed-off-by: NHeinrich Schuchardt <xypron.glpk@gmx.de> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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