rpc: comment on linux_cred encoding, treat all as unsigned

rpc: comment on linux_cred encoding, treat all as unsigned

commit 6a36978e6931e6601be586eb313375335f2cfaa3 upstream.

The encoding of linux creds is a bit confusing.

Also: I think in practice it doesn't really matter whether we treat any
of these things as signed or unsigned, but unsigned seems more
straightforward: uid_t/gid_t are unsigned and it simplifies the ngroups
overflow check.

Tested-by: Simo Sorce <simo@redhat.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>