iservice: fix off by one error

In case there is more than one non-ignored interface domain, the start
of the next domain was off by one glyph. That meant that all but the
first domain was ignored when converting to MULTI_SZ.

Reported-by: Marc Heuse <marc@srlabs.de>
Reported-by: stephan@srlabs.de
Change-Id: I3ebf30f6d9edc66eb54fb3f1b5634c96d156b1ca
Signed-off-by: Heiko Hund <heiko@ist.eigentlich.net>
Acked-by: Gert Doering <gert@greenie.muc.de>
Gerrit URL: https://gerrit.openvpn.net/c/openvpn/+/1395
Message-Id: <20251126104938.5612-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg34678.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>

Author: d12fk

src/openvpnserv/interactive.c

@@ -2234,7 +2234,8 @@ GetItfDnsDomains(HKEY itf, PCWSTR search_domains, PWSTR domains, PDWORD size)
                     return NO_ERROR;
                 }
 
-                pos = comma + 1;
+                /* Comma pos is now +1 after adding leading dot */
+                pos = comma + 2;
             }
         }
     }