openvpn: Fixed openvpn_read() on empty configuration.

When plugin loaded without configuration, it starts to spam logs with message
'read-function of plugin `openvpn' failed'.

Issue: #1932

diff --git a/src/openvpn.c b/src/openvpn.c
index 00ae736..be9a4dc 100644 (file)
--- a/src/openvpn.c
+++ b/src/openvpn.c
@@ -525,6 +525,9 @@ static int openvpn_read (void)
        int  read;
 
        read = 0;
+       
+       if (vpn_num == 0)
+               return (0);
 
        /* call the right read function for every status entry in the list */
        for (int i = 0; i < vpn_num; i++)
@@ -659,8 +662,8 @@ static int openvpn_config (const char *key, const char *value)
 
                if (status_version == 0)
                {
-                       WARNING ("openvpn plugin: unable to detect status version, \
-                                       discarding status file \"%s\".", value);
+                       WARNING ("openvpn plugin: unable to detect status version, "
+                                       "discarding status file \"%s\".", value);
                        return (1);
                }