code cleanup: don't add a \0 to voices_language in LoadVoice().

This is unnecessary since the string is already null terminated in the
V_LANGUAGE switch case. sscanf creates a null terminated string in
language_name, which is then copied to voice_language by strcpy (keeping
the \0).

src/libespeak-ng/voices.c

 				return NULL; // no dictionary loaded
 			}
 		}
-
-		voice_languages[langix] = 0;
 	}
 
 	return voice;