Fix misuse of matplotlib private function that was causing redraw problems.

IPython/zmq/pylab/backend_inline.py

@@ -95,7 +95,7 b' def svg_from_canvas(canvas):'
     """ Return a string containing the SVG representation of a FigureCanvasSvg.
     """
     string_io = StringIO()
-    canvas.print_svg(string_io)
+    canvas.print_figure(string_io, format='svg')
     return string_io.getvalue()