Explicitly close read and write of Popen to latex

jenshnielsen · jenshnielsen · commit 268a3e794152 · 2014-07-26T10:38:05.000+02:00
This avoids a warning in the test suite on python3.4. When reading
and writing from directly from stdout and stdin of the process they
should be explicitly closed afterwards.
diff --git a/lib/matplotlib/backends/backend_pgf.py b/lib/matplotlib/backends/backend_pgf.py
@@ -341,6 +341,8 @@ def _cleanup(self):
             return
         try:
             self.latex_stdin_utf8.close()
+            self.latex.stdout.close()
+            self.latex.stdin.close()
             self.latex.communicate()
             self.latex.wait()
         except:
