Make the entry point a function

otherwise it breaks the generated entry point loader, which will work
but display a traceback on exit

poezio/__main__.py

@@ -1,7 +1,9 @@
-from poezio.poezio import test_curses, main
+def run():
+    from poezio.poezio import test_curses, main
 
-if test_curses():
-    main()
-else:
-    import sys
-    sys.exit(1)
+    if test_curses():
+        main()
+    else:
+        import sys
+        sys.exit(1)
+    return 0

setup.py

@@ -96,7 +96,7 @@ setup(name="poezio",
                    'poezio_themes': 'data/themes'},
       package_data={'poezio': ['default_config.cfg']},
       scripts=['scripts/poezio_gpg_export'],
-      entry_points={'console_scripts': ['poezio = poezio.__main__']},
+      entry_points={'console_scripts': ['poezio = poezio.__main__:run']},
       data_files=([('share/man/man1/', ['data/poezio.1']),
                    ('share/poezio/', ['README.rst', 'COPYING', 'CHANGELOG'])]
                   + find_doc('share/doc/poezio/source', 'source')