grass.py: don't discard clean_temp stderr output

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@65257 15284696-431f-4ddb-bdfa-cd5b030d7da7

lib/init/grass.py

@@ -1226,7 +1226,7 @@ def done_message():
 def clean_temp():
     message(_("Cleaning up temporary files..."))
     nul = open(os.devnull, 'w')
-    call([gpath("etc", "clean_temp")], stdout=nul, stderr=nul)
+    call([gpath("etc", "clean_temp")], stdout=nul)
     nul.close()