drm/amdgpu: fix incorrect use of fcheck

drm/amdgpu: fix incorrect use of fcheck

BugLink: https://bugs.launchpad.net/bugs/1835972
commit bce31d4c1ae8865d6382e3a27b07b4bb8e020ade upstream.

The usage isn't RCU protected.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
CC: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>