Enabled style and CERT-C addon for CPPCHECK (#869)

* Enabled style and CERT-C addon for CPPCHECK with some suppressions and fixed the defects found..

src/bacnet/bacdevobjpropref.c

@@ -726,7 +726,7 @@ int bacapp_decode_obj_property_ref(
         &object_identifier.instance);
     if (len > 0) {
         apdu_len += len;
-    } else if (len <= 0) {
+    } else {
         return BACNET_STATUS_ERROR;
     }
     /* property-identifier  [1] BACnetPropertyIdentifier */
@@ -734,7 +734,7 @@ int bacapp_decode_obj_property_ref(
         &apdu[apdu_len], apdu_size - apdu_len, 1, &property_identifier);
     if (len > 0) {
         apdu_len += len;
-    } else if (len <= 0) {
+    } else {
         return BACNET_STATUS_ERROR;
     }
     if (reference) {