Fix broken syntax

IPython/rlineimpl.py

@@ -43,7 +43,7 b" if sys.platform == 'darwin' and have_readline:"
         except IOError, (errno, strerror):
             if errno == 4:
                 continue
-            else
+            else:
                 break
 
     if status == 0 and len(result) > 0: