generator: Fix typo in error message for RConstOptString.

diff --git a/src/generator.ml b/src/generator.ml
index 20f7ac0..52e7aba 100755 (executable)
--- a/src/generator.ml
+++ b/src/generator.ml
@@ -5712,7 +5712,7 @@ let rec generate_actions_pod () =
 The string is owned by the guest handle and must I<not> be freed.\n\n"
          | RConstOptString _ ->
              pr "This function returns a string which may be NULL.
-There is way to return an error from this function.
+There is no way to return an error from this function.
 The string is owned by the guest handle and must I<not> be freed.\n\n"
          | RString _ ->
              pr "This function returns a string, or NULL on error.