ndpi: check ndpi_finalize_initialization result

It returns -1 when the dissectors could not be initialized, in which
case the module was used anyway. Free it and fail module creation
instead; the callers already handle that.

Ticket: 8077

plugins/ndpi/ndpi.c

@@ -164,7 +164,10 @@ static struct ndpi_detection_module_struct *NdpiModuleNew(bool shared_caches)
         }
     }
 
-    ndpi_finalize_initialization(ndpi);
+    if (ndpi_finalize_initialization(ndpi) != 0) {
+        ndpi_exit_detection_module(ndpi);
+        return NULL;
+    }
     return ndpi;
 }