nixos/vsftpd: fix invalid implication in assertions

Changed files
+1 -1
nixos
modules
services
networking
+1 -1
nixos/modules/services/networking/vsftpd.nix
···
}
{
assertion = (cfg.enableVirtualUsers -> cfg.userDbPath != null)
-
&& (cfg.enableVirtualUsers -> cfg.localUsers != null);
+
&& (cfg.enableVirtualUsers -> cfg.localUsers);
message = "vsftpd: If enableVirtualUsers is true, you need to setup both the userDbPath and localUsers options.";
}];