Fix tsan_rv as it was broken due to recent "testcase" failures

tools/valgrind/tsan_analyze.py

 #!/usr/bin/env python
 # Copyright (c) 2011 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # tsan_analyze.py
 
 ''' Given a ThreadSanitizer output file, parses errors and uniques them.'''
 
 import gdb_helper
@@ skipping 49 matching lines @@
   TSAN_ASSERTION = "Assertion failed: "
 
   def __init__(self, source_dir, use_gdb=False):
     '''Reads in a set of files.
 
     Args:
       source_dir: Path to top of source tree for this build
     '''
 
     self._use_gdb = use_gdb
+    self._cur_testcase = None
 
   def ReadLine(self):
     self.line_ = self.cur_fd_.readline()
     self.stack_trace_line_ = None
     if not self._use_gdb:
       return
     global TheAddressTable
     match = TsanAnalyzer.LOAD_LIB_RE.match(self.line_)
     if match:
       binary, ip = match.groups()
@@ skipping 187 matching lines @@
     parser.error("no filename specified")
   filenames = args
 
   logging.getLogger().setLevel(logging.INFO)
   analyzer = TsanAnalyzer(options.source_dir, use_gdb=True)
   return analyzer.Report(filenames, None)
 
 
 if __name__ == '__main__':
   sys.exit(main())