ITS#9831 Advance connections[index] correctly

servers/slapd/connection.c

@@ -869,13 +869,12 @@ Connection* connection_next( Connection *c, ber_socket_t *index )
 
 	c = NULL;
 
-	for(; *index < dtblsize; (*index)++) {
-		if( connections[*index].c_sb ) {
-			c = &connections[(*index)++];
+	for(; *index < dtblsize; c=NULL) {
+		c = &connections[(*index)++];
+		if( c->c_sb ) {
 			ldap_pvt_thread_mutex_lock( &c->c_mutex );
 			if ( c->c_conn_state == SLAP_C_INVALID ) {
 				ldap_pvt_thread_mutex_unlock( &c->c_mutex );
-				c = NULL;
 				continue;
 			}
 			break;