Fixed the unknown packets on clients from october 2015 onwards

Sorry guys, we actually created this issue ourselves, because we overwrote the data of the next incoming packet eventually.
Maybe this will make 2015-10-29 also useable again.

Fixes #1049.

src/map/clif.c

@@ -9796,13 +9796,7 @@ static bool clif_process_message(struct map_session_data* sd, int format, char**
 		messagelen = textlen - NAME_LENGTH; // this should be the message length (w/ zero byte included)
 	}
 
-#if PACKETVER >= 20151001
-	if (message[messagelen-1] != '\0')
-	{
-		message[messagelen++] = '\0';
-	}
-#endif
-
+#if PACKETVER < 20151001
 	// the declared length must match real length
 	if( messagelen != strnlen(message, messagelen)+1 ) {
 		ShowWarning("clif_process_message: Received malformed packet from player '%s' (length is incorrect)!\n", sd->status.name);
@@ -9814,6 +9808,7 @@ static bool clif_process_message(struct map_session_data* sd, int format, char**
 		ShowWarning("clif_process_message: Player '%s' sent an unterminated message string!\n", sd->status.name);
 		return false;
 	}
+#endif
 
 	// messages mustn't be too long
 	if( messagelen > CHAT_SIZE_MAX-1 ) {