Bug 808410 - Ensure retVal is set even when mochitest.cleanup did not generate an exception; r=ahal

testing/mochitest/runtestsb2g.py

@@ -533,7 +533,7 @@ def main():
             mochitest.cleanup(None, options)
         except:
             pass
-            sys.exit(1)
+        retVal = 1
 
     sys.exit(retVal)