Limit scale to 16x mainly to put an upper bound on the amount of ram we might use.

src/zms.cpp

@@ -166,6 +166,10 @@ int main(int argc, const char *argv[], char **envp) {
       frames_to_send = strtoll(value, nullptr, 10);
     } else if ( !strcmp(name, "scale") ) {
       scale = atoi(value);
+      if (scale > 1600) {
+        Warning("Limiting scale to 16x");
+        scale = 1600;
+      }
     } else if ( !strcmp(name, "rate") ) {
       rate = atoi(value);
     } else if ( !strcmp(name, "maxfps") ) {