perf bench: Fix two memory leaks detected with ASan

perf bench: Fix two memory leaks detected with ASan

ASan reports memory leaks while running:

  $ perf bench sched all

Fixes: e27454cc6352c422 ("perf bench: Add sched-messaging.c: Benchmark for scheduler and IPC mechanisms based on hackbench")
Signed-off-by: Sohaib Mohamed <[email protected]>
Acked-by: Ian Rogers <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Hitoshi Mitake <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Paul Russel <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Pierre Gondois <[email protected]>
Link: http://lore.kernel.org/lkml/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>