Don't set bi_db_config since we have no config options

servers/slapd/back-dnssrv/config.c

@@ -29,6 +29,7 @@
 #include "slap.h"
 #include "proto-dnssrv.h"
 
+#if 0
 int
 dnssrv_back_db_config(
     BackendDB	*be,
@@ -50,3 +51,4 @@ dnssrv_back_db_config(
 	/* no configuration options (yet) */
 	return SLAP_CONF_UNKNOWN;
 }
+#endif

servers/slapd/back-dnssrv/init.c

@@ -49,7 +49,7 @@ dnssrv_back_initialize(
 
 	bi->bi_db_init = 0;
 	bi->bi_db_destroy = 0;
-	bi->bi_db_config = dnssrv_back_db_config;
+	bi->bi_db_config = 0 /* dnssrv_back_db_config */;
 	bi->bi_db_open = 0;
 	bi->bi_db_close = 0;