Return 0 from run_abi_tests.py, regardless of whethere there are diffs

Change-Id: I3bc656ecfa6979e9fcd544f8a43840acf621a75b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/106880
Reviewed-by: Alexander Thomas <[email protected]>
Commit-Queue: Liam Appelbe <[email protected]>

Author: liamappelbe

tools/run_abi_tests.py

@@ -150,7 +150,6 @@ def makeLog(diffs, results, logRecords):
 def diffAllResults(tests):
   allResults = readAllTestFiles(tests, lambda test: test.resultFile)
   allLogs = readAllTestFiles(tests, lambda test: test.logFile)
-  anyDiff = False
   logDir = os.path.join(outDir, 'logs')
   makeDirs(logDir)
   resultFileName = os.path.join(logDir, 'results.json')
@@ -163,14 +162,13 @@ def diffAllResults(tests):
         if diffs:
           logRecords = allLogs[name] if name in allLogs else []
           logFile.write(json.dumps(makeLog(diffs, results, logRecords)) + '\n')
-          anyDiff = True
-  return anyDiff
 
 
 def main():
   tests = buildAllTests()
   runAllTests(tests)
-  return 1 if diffAllResults(tests) else 0
+  diffAllResults(tests)
+  return 0
 
 
 if __name__ == '__main__':