profile: close 'fp' in all cases

There are no way for this to happen today, but better be safe than sorry, no
one know how the code will evolve. We now make sure the file pointer is closed
even is profiler is None.

mercurial/profiling.py

@@ -214,8 +214,7 b' class profile(object):'
             raise
 
     def __exit__(self, exception_type, exception_value, traceback):
-        if self._profiler is None:
-            return
+        if self._profiler is not None:
         self._profiler.__exit__(exception_type, exception_value, traceback)
         if self._output == 'blackbox':
             val = 'Profile:\n%s' % self._fp.getvalue()