treewide: Replace kmalloc with kmalloc_obj for non-scalar types

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

Source kernel commit: 69050f8d6d075dc01af7a5f2f550a8067510366f

This is the result of running the Coccinelle script from
scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to
avoid scalar types (which need careful case-by-case checking), and
instead replace kmalloc-family calls that allocate struct or union
object instances:

Single allocations:     kmalloc(sizeof(TYPE), ...)
are replaced with:      kmalloc_obj(TYPE, ...)

Array allocations:      kmalloc_array(COUNT, sizeof(TYPE), ...)
are replaced with:      kmalloc_objs(TYPE, COUNT, ...)

Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...)
are replaced with:      kmalloc_flex(*PTR, FAM, COUNT, ...)

(where TYPE may also be *VAR)

The resulting allocations no longer return "void *", instead returning
"TYPE *".

Signed-off-by: Kees Cook <kees@kernel.org>