fixup! MAINT: Warn when too many steps are requested

src/main.cpp

@@ -268,7 +268,7 @@ auto on_go = [](const Go& go) {
   if(n > H_max) {
     char msg[256];
     snprintf(msg, sizeof(msg),
-      'Not enough memory allocated for %d steps - using %d instead',
+      "Not enough memory allocated for %d steps - using %d instead",
       n, H_max
     );
     logging::warn(msg);