Use "Delta" to refer to the difference between measurements, rather than
"Error", so scripts that look for "Error" aren't confused into thinking
there was a failure.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
                printf("Looped for %lu instructions, overhead %lu\n", instructions, overhead);
                printf("Expected %lu\n", expected);
                printf("Actual   %llu\n", event->result.value);
-               printf("Error    %ld, %f%%\n", difference, percentage);
+               printf("Delta    %ld, %f%%\n", difference, percentage);
                printf("Took %d EBBs\n", ebb_state.stats.ebb_count);
        }