Fix binderThroughputTest -m option

The -m option allows the user to specify the estimated
max latency to calibrate buckets used for percentile
calculations. The option didn't work because the
time_per_bucket was not being set so the default value
was used.

Test: verified correct -m operation
Bug: 65052581
Change-Id: I96d6ba0271edaffda0bd9cccfef5d559d3bf111c
Signed-off-by: Todd Kjos <tkjos@google.com>
diff --git a/libs/binder/tests/binderThroughputTest.cpp b/libs/binder/tests/binderThroughputTest.cpp
index 455f2c4..e35f491 100644
--- a/libs/binder/tests/binderThroughputTest.cpp
+++ b/libs/binder/tests/binderThroughputTest.cpp
@@ -381,6 +381,7 @@
             // No need to run training round in this case.
             if (atoi(argv[i+1]) > 0) {
                 max_time_bucket = strtoull(argv[i+1], (char **)NULL, 10) * 1000;
+                time_per_bucket = max_time_bucket / num_buckets;
                 i++;
             } else {
                 cout << "Max latency -m must be positive." << endl;