asyncio: Don't special-case GeneratorExit in Condition.wait().

Lib/asyncio/locks.py

@@ -251,7 +251,6 @@ class Condition:
         if not self.locked():
             raise RuntimeError('cannot wait on un-acquired lock')
 
-        keep_lock = True
         self.release()
         try:
             fut = futures.Future(loop=self._loop)
@@ -262,11 +261,7 @@ class Condition:
             finally:
                 self._waiters.remove(fut)
 
-        except GeneratorExit:
-            keep_lock = False  # Prevent yield in finally clause.
-            raise
         finally:
-            if keep_lock:
             yield from self.acquire()
 
     @tasks.coroutine