fix: Check adapter before setting MTU (#1194)

src/network.sh

@@ -30,7 +30,6 @@ set -Eeuo pipefail
 : "${DNSMASQ_DEBUG:=""}"
 : "${DNSMASQ:="/usr/sbin/dnsmasq"}"
 : "${DNSMASQ_PID:="/var/run/dnsmasq.pid"}"
-: "${DNSMASQ_CONF_DIR:="/etc/dnsmasq.d"}"
 
 # Sanitize variables
 MAC=$(strip "$MAC")
@@ -634,8 +633,8 @@ closeNetwork() {
 
   disabled "$NETWORK" && return 0
 
-  exec 30<&- || true
-  exec 40<&- || true
+  exec 30>&- 2>/dev/null || true
+  exec 40>&- 2>/dev/null || true
 
   closeBridge
 
@@ -901,6 +900,9 @@ else
 fi
 
 NET_OPTS+=" -device $ADAPTER,id=net0,netdev=hostnet0,romfile=,mac=$VM_NET_MAC"
-[[ "$MTU" != "0" && "$MTU" != "1500" ]] && NET_OPTS+=",host_mtu=$MTU"
+
+if [[ "${ADAPTER,,}" == "virtio-net-pci" && "$MTU" != "0" && "$MTU" != "1500" ]]; then
+  NET_OPTS+=",host_mtu=$MTU"
+fi
 
 return 0