Merge pull request #5593 from pan-/ble-fix-equality-comparison

BLE: Fix greater than or equal to comparision in GattCharacteristic.

Author: 0xc0170

features/FEATURE_BLE/ble/GattCharacteristic.h

@@ -85,7 +85,7 @@
  * A characteristic is a typed value used in a service. It contains a set of
  * properties that define client operations supported by the characteristic.
  * A characteristic may also include descriptors; a descriptor exposes
- * metainformation associated to a characteristic, such as the unit of its value, 
+ * metainformation associated to a characteristic, such as the unit of its value,
  * its human readable name or a control point attribute that allows the client to
  * subscribe to the characteristic notifications.
  *
@@ -1632,7 +1632,7 @@ class GattCharacteristic {
      */
     GattAttribute *getDescriptor(uint8_t index)
     {
-        if (index = _descriptorCount) {
+        if (index >= _descriptorCount) {
             return NULL;
         }