2.6.38.2 - perf - unused-but-set-variable

$ make
    CC bench/sched-pipe.o
bench/sched-pipe.c: In function 'bench_sched_pipe':
bench/sched-pipe.c:58:6: error: variable 'ret' set but not used [-Werror=unused-but-set-variable]
cc1: all warnings being treated as errors

make: *** [bench/sched-pipe.o] Error 1

gcc version 4.6.0 20110331 (Red Hat 4.6.0-2) (GCC)