vm: object: zero-initialise pages allocated for vm-object

vm/vm-object.c

@@ -286,6 +286,8 @@ extern struct vm_page *vm_object_alloc_page(
 			return NULL;
 		}
 
+		void *page_buf = vm_page_get_vaddr(page);
+		memset(page_buf, 0x0, vm_page_get_size_bytes(page));
 		tracek("vm-object: [%s] alloc offset %zx -> page %zx",
 		       vo->vo_name,
 		       offset,