sunrpc: Add missing kuids conversion for printing

m68k/allmodconfig:

net/sunrpc/auth_generic.c: In function ‘generic_key_timeout’:
net/sunrpc/auth_generic.c:241: warning: format ‘%d’ expects type ‘int’, but
argument 2 has type ‘kuid_t’

commit cdba321e

 ("sunrpc: Convert kuids and
kgids to uids and gids for printing") forgot to convert one instance.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>