CHROMIUM: nfs-ganesha: Build errors for libntirpc

Two errors in build, one caused by abs over unsigned int, the other
caused by variable size struct.

BUG=chromium:719729
TEST=builds succesfully and tested on device
CQ-DEPEND=CL:500748

Change-Id: Ib2ec10d05a1102410454d86a10d133fdaf122d45
Reviewed-on: https://chromium-review.googlesource.com/500388
Commit-Ready: Stephen Barber <smbarber@chromium.org>
Tested-by: Abbas Naderi <abiusx@chromium.org>
Reviewed-by: Dylan Reid <dgreid@chromium.org>
2 files changed