scoutfs: Don't destroy sroot unless srch_search_xattrs() was called

Until then, sroot is uninitialized so it's not safe to call
destroy_rb_root().

Signed-off-by: Andy Grover <agrover@versity.com>

kmod/src/ioctl.c

@@ -836,8 +836,10 @@ static long scoutfs_ioc_search_xattrs(struct file *file, unsigned long arg)
 		ret = -EFAULT;
 	else
 		ret = 0;
-out:
+
 	scoutfs_srch_destroy_rb_root(&sroot);
+
+out:
 	kfree(name);
 	return ret ?: total;
 }