Added handling of the case when length is -1, allowing the code to just test

against characters being zero, rather than against length, which is now only
done when a valid value of length (i.e >=0) is passed in.

src/osgText/EncodedText.cpp

@@ -213,7 +213,7 @@ void EncodedText::setText(const unsigned char* text, int length)
 
         int character = getNextCharacter(text);
         int charCount = (int)(text-textStart);
-        while ((character) && (charCount <= length))
+        while ((character) && (length<0 || (charCount <= length)))
         {
             _unicodeText.push_back(character);
             character = getNextCharacter(text);