Remove return syntax if retval is unexpected

sphinx/application.py

@@ -301,7 +301,7 @@ class Sphinx(object):
                     self.info('not yet created')
                 else:
                     self.info('failed: %s' % err)
-                return self._init_env(freshenv=True)
+                self._init_env(freshenv=True)
 
     def _init_builder(self, buildername):
         if buildername is None:

sphinx/builders/epub.py

@@ -413,7 +413,7 @@ class EpubBuilder(StandaloneHTMLBuilder):
         """
         self.fix_ids(doctree)
         self.add_visible_links(doctree, self.config.epub_show_urls)
-        return StandaloneHTMLBuilder.write_doc(self, docname, doctree)
+        StandaloneHTMLBuilder.write_doc(self, docname, doctree)
 
     def fix_genindex(self, tree):
         """Fix href attributes for genindex pages."""