sessions: add a helper to clear the stored return path

app/controllers/devise/store_location_extension.rb

@@ -0,0 +1,10 @@
+module Devise
+  # Useful helpers additions to Devise::Controllers::StoreLocation
+  module StoreLocationExtension
+    # Delete the url stored in the session for the given scope.
+    def clear_stored_location_for(resource_or_scope)
+      session_key = send(:stored_location_key_for, resource_or_scope)
+      session.delete(session_key)
+    end
+  end
+end