vfs_fruit: fix offset and len handling for AFP_AfpInfo stream
When reading from the AFP_AfpInfo stream, OS X ignores the offset from
the request and always reads from offset=0.
The offset bounds check has a off-by-1 bug in OS X, so a request
offset=60 (AFP_AfpInfo stream has a ficed size of 60 bytes), len=1
returns 1 byte from offset 0 insteaf of returning 0.
Bug: https://bugzilla.samba.org/show_bug.cgi?id=11347
Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>