[PATCH pve-network] sdn: dhcp: only regenerate if no cfg is undef

[Hannes Laimer <h.laimer@proxmox.com>]

Except for when there is no `.running-config` at all, these three can't
really be `undef`, and that is what this guard should check.

These three can either all be `undef`, or none. So this does not change
behaviour, but should be a little clearer.

Signed-off-by: Hannes Laimer <h.laimer@proxmox.com>
---
 src/PVE/Network/SDN/Dhcp.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/PVE/Network/SDN/Dhcp.pm b/src/PVE/Network/SDN/Dhcp.pm
index 65e40d4..f6ce842 100644
--- a/src/PVE/Network/SDN/Dhcp.pm
+++ b/src/PVE/Network/SDN/Dhcp.pm
@@ -63,7 +63,7 @@ sub regenerate_config {
     my $zone_cfg = $cfg->{zones};
     my $vnet_cfg = $cfg->{vnets};
     my $subnet_cfg = $cfg->{subnets};
-    return if !$zone_cfg && !$subnet_cfg;
+    return if !$zone_cfg || !$vnet_cfg || !$subnet_cfg;
 
     my $nodename = PVE::INotify::nodename();
 
-- 
2.47.3