allow reconfiguring a running watchdog

Author: paul-szczepanek-arm

drivers/source/Watchdog.cpp

@@ -34,18 +34,14 @@ bool Watchdog::start(uint32_t timeout)
     MBED_ASSERT(timeout > 0);
 
     core_util_critical_section_enter();
-    if (_running) {
-        core_util_critical_section_exit();
-        return false;
-    }
     watchdog_config_t config;
     config.timeout_ms = timeout;
     watchdog_status_t sts = hal_watchdog_init(&config);
     if (sts == WATCHDOG_STATUS_OK) {
         _running = true;
     }
     core_util_critical_section_exit();
-    return _running;
+    return (sts == WATCHDOG_STATUS_OK);
 }
 
 bool Watchdog::start()