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>

kernel/crash_dump_dm_crypt.c

@@ -252,7 +252,7 @@ static struct config_item *config_keys_make_item(struct config_group *group,
 		return ERR_PTR(-EINVAL);
 	}
 
-	config_key = kzalloc(sizeof(struct config_key), GFP_KERNEL);
+	config_key = kzalloc_obj(struct config_key, GFP_KERNEL);
 	if (!config_key)
 		return ERR_PTR(-ENOMEM);