Don't print error if we can't talk to hwservicemanager.

This currently fails as a non-root user due to SEPolicy,
and is causing CTS test failures. Until we figure out
the policy on b/34242478, don't print an error to allow
the test to pass again.

Test: cts-tradefed run cts --module CtsAtraceHostTestCases --test
android.atrace.cts.AtraceHostTest#testSimpleRun

Bug: 33814619
Change-Id: Ie5578639028e7890284d71bbf1b753f5803ca4af
diff --git a/cmds/atrace/atrace.cpp b/cmds/atrace/atrace.cpp
index af5380c..320d11d 100644
--- a/cmds/atrace/atrace.cpp
+++ b/cmds/atrace/atrace.cpp
@@ -551,7 +551,8 @@
         }
     });
     if (!listRet.isOk()) {
-        fprintf(stderr, "failed to list services: %s\n", listRet.description().c_str());
+        // TODO(b/34242478) fix this when we determine the correct ACL
+        //fprintf(stderr, "failed to list services: %s\n", listRet.description().c_str());
     }
 }