Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Fabricio <fabriciopolicarpo0@gmail.com>

Author: fpolica91

test/test-disable-dhcp.sh

@@ -44,10 +44,15 @@ echo >&2 "===== QEMU BEGIN ====="
 	-nographic 2>&1 | tee serial.log
 echo >&2 "===== QEMU FINISH ====="
 
-if grep -q "net0-ip=${GATEWAY%.*}." serial.log; then
+if ! grep -q "dhcp-failed-as-expected" serial.log; then
 	echo >&2 "ERROR: guest obtained a DHCP lease, but DHCP should be disabled"
 	exit 1
 fi
 
+if grep -Eq "net0-ip=[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+" serial.log; then
+	echo >&2 "ERROR: guest has an IPv4 address despite DHCP being disabled"
+	exit 1
+fi
+
 echo >&2 "OK: guest obtained no DHCP lease (DHCP disabled as expected)"
 rm -f serial.log