Day 15 part 1 - wrong result for `getattr` if inode is not 1

[neil-greenwood]

In the second (i.e. non-empty) implementation of getattr, the result is:

reply.error(ENOSYS);

but it should be:

reply.error(ENOENT);

We want a 'File not found' rather than a 'Function not implemented' message.