Improve source_info commenting and fix neutrino slow link

vnc/vnc.c

@@ -1905,7 +1905,6 @@ lib_mod_connect(struct vnc *v)
     int error;
     int i;
     int check_sec_result;
-    struct source_info *si;
 
     v->server_msg(v, "VNC started connecting", 0);
     check_sec_result = 1;
@@ -1955,8 +1954,7 @@ lib_mod_connect(struct vnc *v)
     g_sprintf(text, "VNC connecting to %s %s", v->ip, con_port);
     v->server_msg(v, text, 0);
 
-    si = (struct source_info *) (v->si);
-    v->trans->si = si;
+    v->trans->si = v->si;
     v->trans->my_source = XRDP_SOURCE_MOD;
 
     error = trans_connect(v->trans, v->ip, con_port, 3000);

vnc/vnc.h

@@ -56,6 +56,8 @@ enum vnc_resize_status
     VRS_DONE
 };
 
+struct source_info;
+
 struct vnc
 {
     int size; /* size of this struct */
@@ -124,7 +126,7 @@ struct vnc
     tintptr handle; /* pointer to self as long */
     tintptr wm;
     tintptr painter;
-    tintptr si;
+    struct source_info *si;
     /* mod data */
     int server_width;
     int server_height;