add changes from whisper.cpp update

src/error.rs

@@ -37,6 +37,12 @@ pub enum WhisperError {
     GenericError(c_int),
     /// Whisper failed to convert the provided text into tokens.
     InvalidText,
+    /// Creating a state pointer failed. Check stderr for more information.
+    FailedToCreateState,
+    /// State pointer ID already exists.
+    StateIdAlreadyExists,
+    /// State pointer ID does not exist.
+    StateIdDoesNotExist,
 }
 
 impl From<Utf8Error> for WhisperError {