Use a flexible array member to combine kzalloc and kcalloc in one
allocation so they can be freed together.
Add __counted_by for extra runtime analysis. Move counting variable
assignment right after allocation as done by kzalloc_flex with GCC >=
15.
Signed-off-by: Rosen Penev <rosenp@gmail.com>
Reviewed-by: Brian Masney <bmasney@redhat.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>