ftp: reenable debug check; improve debug log

src/app-layer-ftp.c

@@ -1067,8 +1067,7 @@ static AppLayerResult FTPDataParse(Flow *f, FtpDataState *ftpdata_state,
     } else {
         if (ftpdata_state->state == FTPDATA_STATE_FINISHED) {
             SCLogDebug("state is already finished");
-            // TODO put back the assert after deciding on the bug...
-            // DEBUG_VALIDATE_BUG_ON(input_len); // data after state finished is a bug.
+            DEBUG_VALIDATE_BUG_ON(input_len); // data after state finished is a bug.
             SCReturnStruct(APP_LAYER_OK);
         }
         if ((direction & ftpdata_state->direction) == 0) {
@@ -1099,7 +1098,7 @@ static AppLayerResult FTPDataParse(Flow *f, FtpDataState *ftpdata_state,
     if (eof) {
         ret = FileCloseFile(ftpdata_state->files, &sbcfg, NULL, 0, flags);
         ftpdata_state->state = FTPDATA_STATE_FINISHED;
-        SCLogDebug("closed because of eof");
+        SCLogDebug("closed because of eof: state now FTPDATA_STATE_FINISHED");
     }
 out:
     if (ret < 0) {