Valgrind returns error exit code when errors found (#1011)
Valgrind returns error exit code when errors found (#1011)

By default Valgrind will return the exit code from the tested process.
Since our test can return 0 (ALL TESTS PASS) even when a leak was
found we need to tell Valgrind to return an error code.
This will fail the CI job when issues are found.
redis/hiredis,redis/hiredis,redis/hiredis