replacing usage of vfs_readlink with new readlink_copy API
see: http://permalink.gmane.org/gmane.linux.kernel.commits.head/445090

diff -rupN vmblock-only/linux/inode.c vmblock-only/linux/inode.c
--- vmblock-only/linux/inode.c	2014-10-05 23:20:14.545218357 -0400
+++ vmblock-only/linux/inode.c	2014-10-05 23:33:01.549259933 -0400
@@ -178,7 +178,7 @@ InodeOpReadlink(struct dentry *dentry,
       return -EINVAL;
    }
 
-   return vfs_readlink(dentry, buffer, buflen, iinfo->name);
+   return readlink_copy(buffer, buflen, iinfo->name);
 }