v2:
Fix single versus vendor-private length checking for ARB_imaging subset
extensions. (Julien Cristau)

v3:
Fix single versus vendor-private length checking for ARB_imaging subset
extensions. (Julien Cristau)

v4: backport to nx-libs 3.6.x (Mike DePaulo)
Reviewed-by: Michal Srb <msrb@suse.com>
Reviewed-by: Andy Ritger <aritger@nvidia.com>
Signed-off-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Julien Cristau <jcristau@debian.org>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Signed-off-by: Fedora X Ninjas <x@fedoraproject.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

fix safe_Add