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/audit_watch.c

@@ -139,7 +139,7 @@ static struct audit_parent *audit_init_parent(const struct path *path)
 	struct audit_parent *parent;
 	int ret;
 
-	parent = kzalloc(sizeof(*parent), GFP_KERNEL);
+	parent = kzalloc_obj(*parent, GFP_KERNEL);
 	if (unlikely(!parent))
 		return ERR_PTR(-ENOMEM);
 
@@ -161,7 +161,7 @@ static struct audit_watch *audit_init_watch(char *path)
 {
 	struct audit_watch *watch;
 
-	watch = kzalloc(sizeof(*watch), GFP_KERNEL);
+	watch = kzalloc_obj(*watch, GFP_KERNEL);
 	if (unlikely(!watch))
 		return ERR_PTR(-ENOMEM);