From 460c7248bb507c18ca75dec1c4d1e2e636ebd389 Mon Sep 17 00:00:00 2001
From: jcmichelou <jean-claude.michelou@spinetix.com>
Date: Tue, 8 May 2018 20:23:48 +0200
Subject: [PATCH] resource.c: Return 0 if there is no observer to notify.

According to documentation, coap_resource_notify_observers() must return 0 if
no observer will be notified. This can help an application release resources
associated to that resource for observation.
---
 src/resource.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/resource.c b/src/resource.c
index 59add5ac..b695398a 100644
--- a/src/resource.c
+++ b/src/resource.c
@@ -827,6 +827,8 @@ coap_resource_notify_observers(coap_resource_t *r, const coap_string_t *query) {
     if (!found)
       return 0;
   } else {
+    if ( !r->subscribers )
+      return 0;
     r->dirty = 1;
   }