-1 is also a success for service uninstall

packages/zabbix_agent.xml

@@ -2,7 +2,7 @@
 <packages>
     <package id="zabbix_agent"
              name="Agent de supervision Zabbix"
-             revision="24"
+             revision="25"
              priority="10">
 
         <variable name="PKG_VERSION" value="3.0.4" />
@@ -25,6 +25,7 @@
         <upgrade cmd='"%PROGRAMFILES%\Zabbix Agent\zabbix_agentd.exe" -c "%PROGRAMFILES%\Zabbix Agent\zabbix_agentd.conf" --uninstall'>
             <exit code="1" />
             <exit code="0" />
+            <exit code="-1" />
         </upgrade>
         <upgrade cmd='netsh advfirewall firewall del rule name="Zabbix Agent"'>
             <exit code="any" />