Compilation fix for newer mbed-os

Fork of X_NUCLEO_IDB0XA1 by ST

Branch:
72a03e94578ba288a289bed81955d4d04ab6702f
Revision:
269:cd037b36a62b
Parent:
268:c0a1e03c5736
Child:
271:7dc6261c33e5
--- a/source/platform/btle.cpp	Thu Sep 15 10:51:31 2016 +0100
+++ b/source/platform/btle.cpp	Thu Sep 15 10:51:31 2016 +0100
@@ -545,7 +545,7 @@
                         uint8_t write_status = err_code == 0 ? 0 : 1;
 
                         // reply to the shield
-                        tBleStatus err = aci_gatt_write_response(
+                        aci_gatt_write_response(
                             write_req->conn_handle,
                             write_req->attr_handle,
                             write_status,