2.1.0: Cannot save figures in GTK backend #9407

Bug report

Bug summary

When using the GTK backend, when I try to save the figure to a file using the GUI I get an error:

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/matplotlib/backends/backend_gtk.py", line 715, in save_figure
    if startpath != "":
NameError: global name 'startpath' is not defined

It looks like this bug was introduced in #9124 - perhaps you forgot to rename startpath to fname in line backend_gtk.py line 715?

Matplotlib version

• Operating system: arch linux
• Matplotlib version: 2.1.0
• Matplotlib backend: GTKAgg
• Python version: 2.7