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>

arch/powerpc/platforms/book3s/vas-api.c

@@ -266,7 +266,7 @@ static int coproc_open(struct inode *inode, struct file *fp)
 {
 	struct coproc_instance *cp_inst;
 
-	cp_inst = kzalloc(sizeof(*cp_inst), GFP_KERNEL);
+	cp_inst = kzalloc_obj(*cp_inst, GFP_KERNEL);
 	if (!cp_inst)
 		return -ENOMEM;