treewide: Replace kmalloc with kmalloc_obj for non-scalar types

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>

drivers/gpu/drm/tests/drm_mm_test.c

@@ -252,7 +252,7 @@ static void drm_test_mm_align_pot(struct kunit *test, int max)
 	for (bit = max - 1; bit; bit--) {
 		u64 align, size;
 
-		node = kzalloc(sizeof(*node), GFP_KERNEL);
+		node = kzalloc_obj(*node, GFP_KERNEL);
 		if (!node) {
 			KUNIT_FAIL(test, "failed to allocate node");
 			goto out;