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>

lib/test_debug_virtual.c

@@ -29,7 +29,7 @@ static int __init test_debug_virtual_init(void)
 
 	pr_info("PA: %pa for VA: 0x%lx\n", &pa, (unsigned long)va);
 
-	foo = kzalloc(sizeof(*foo), GFP_KERNEL);
+	foo = kzalloc_obj(*foo, GFP_KERNEL);
 	if (!foo)
 		return -ENOMEM;