vfs_fruit: check fake_fd in fruit_pread_meta_stream()

vfs_fruit: check fake_fd in fruit_pread_meta_stream()

Don't call into the next VFS backend if we know we still have a fake-fd. Just
return -1 and the caller has the logic to handle this, which results in
returning a AFP_AfpInfo blob initialized with some defaults.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14596

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>