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We have helpers that work with NULL terminated array of groups, but many drivers only create a single supplemental group, and do not want to declare a group array. Let's provide them with helpers working with a single group. Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>