Fix lint

Author: gaogaotiantian

Lib/bdb.py

@@ -554,7 +554,7 @@ def _set_stopinfo(self, stopframe, returnframe, stoplineno=0, opcode=False,
         # stoplineno >= 0 means: stop at line >= the stoplineno
         # stoplineno -1 means: don't stop at all
         self.stoplineno = stoplineno
-        # cmdframe/cmdlineno is the frame/line number when the user issue 
+        # cmdframe/cmdlineno is the frame/line number when the user issues
         # step/next commands. We don't want to stop at the same line for
         # those commands.
         self.cmdframe = cmdframe