Fix extra ) syntax error

IPython/lib/display.py

@@ -138,7 +138,7 b' class Audio(DisplayObject):'
     def src_attr(self):
         import base64
         if self.embed and (self.data is not None):
-            data = base64=base64.b64encode(self.data).decode('ascii'))
+            data = base64=base64.b64encode(self.data).decode('ascii')
             return """data:{type};base64,{base64}""".format(type=self.mimetype,
                                                             base64=data)
         elif self.url is not None: