lkl: replace strncpy with strscpy

According to Documentation/process/deprecated.rst,
strncpy should be replaced with strscpy.

Signed-off-by: Akira Moroo <retrage01@gmail.com>

Author: retrage

arch/lkl/kernel/setup.c

@@ -61,7 +61,7 @@ int __init lkl_start_kernel(struct lkl_host_operations *ops,
 	va_end(ap);
 
 	if (ops->virtio_devices)
-		strncpy(boot_command_line + ret, ops->virtio_devices,
+		strscpy(boot_command_line + ret, ops->virtio_devices,
 			COMMAND_LINE_SIZE - ret);
 
 	memcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);