Remove comment with very long lines that explained what the code used

to do.

XXX Please be careful when checking in patches to avoid checking in
junk that explains what the patched code used to do.

Python/compile.c

@@ -4628,9 +4628,9 @@ symtable_cellvar_offsets(PyObject **cellvars, int argcount,
 			}
 		}
 	}
-	if (list == NULL)	/* There used to be a check here for the size of */
-		return 0;		/* the list being 0, which would have leaked the */
-						/* list if that condition was ever possible. JRH */
+	if (list == NULL)
+		return 0;
+
 	/* There are cellvars that are also arguments.  Create a dict
 	   to replace cellvars and put the args at the front.
 	*/