xfs: use NULL instead of 0 to initialize a pointer in xfs_ioc_getfsmap

	struct xfs_inode	*ip,

	void			__user *arg)

{

	struct getfsmap_info	info = {0};

	struct getfsmap_info	info = { NULL };

	struct xfs_fsmap_head	xhead = {0};

	struct fsmap_head	head;

	bool			aborted = false;