Fix xattr name comparison in rbtree search for strings that share a prefix.
The *name argument is null terminated, but the xattr name is not, so we
need to use strncmp, but that means adjusting for the case where name is
a prefix of xattr->name.

The corresponding case in __set_xattr() already handles this properly
(although in that case *name is also not null terminated).
Reported-by: NSergiy Kibrik <sakib@meta.ua>
Signed-off-by: NSage Weil <sage@newdream.net>