uac: uac.reg_dump returns an array rpc result

modules/uac/uac_reg.c

@@ -1747,7 +1747,7 @@ static void rpc_uac_reg_refresh(rpc_t* rpc, void* ctx)
 }
 
 rpc_export_t uac_reg_rpc[] = {
-	{"uac.reg_dump", rpc_uac_reg_dump, rpc_uac_reg_dump_doc, 0},
+	{"uac.reg_dump", rpc_uac_reg_dump, rpc_uac_reg_dump_doc, RET_ARRAY},
 	{"uac.reg_info", rpc_uac_reg_info, rpc_uac_reg_info_doc, 0},
 	{"uac.reg_enable",  rpc_uac_reg_enable,  rpc_uac_reg_enable_doc,  0},
 	{"uac.reg_disable", rpc_uac_reg_disable, rpc_uac_reg_disable_doc, 0},