switch touch_atime to struct path

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/stat.c

@@ -307,7 +307,7 @@ SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
 		if (inode->i_op->readlink) {
 			error = security_inode_readlink(path.dentry);
 			if (!error) {
-				touch_atime(path.mnt, path.dentry);
+				touch_atime(&path);
 				error = inode->i_op->readlink(path.dentry,
 							      buf, bufsiz);
 			}