[klibc] kinit: use an enum to silence a clang warning

Clang emits a warning when constant forlding variable length arrays:

    usr/kinit/nfsmount/dummypmap.c:156:8: warning: variable length array folded to constant array as an extension [-Werror,-Wgnu-folding-constant]
                char payload[MAX_UDP_PACKET + offsetof(struct rpc_header, udp)];
    1 error generated.

Using an enum bypasses the constant folding issue.

Signed-off-by: Bill Wendling <morbo@google.com>
[bwh: Correct the component in the subject line]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
1 file changed