b=15670

i=adilger
i=johann

land attachment 16523

fixes this compile warning (which is treated as an error -Werror on XT3's):
during lustrefs-1.6-ss builds:

lustrefs-1.6-ss/lustre/mds/mds_lov.c: In function `mds_lov_read_objids':
mds_lov.c:198: warning: int format, different type arg (arg 10)