STM32F2 assert in SetSysClock replaced

targets/TARGET_STM/TARGET_STM32F2/TARGET_NUCLEO_F207ZG/device/system_clock.c

@@ -30,7 +30,7 @@
 **/
 
 #include "stm32f2xx.h"
-#include "mbed_assert.h"
+#include "mbed_error.h"
 
 /*!< Uncomment the following line if you need to relocate your vector Table in
      Internal SRAM. */
@@ -120,8 +120,8 @@ void SetSysClock(void)
             if (SetSysClock_PLL_HSI() == 0)
 #endif
             {
-                while(1) {
-                    MBED_ASSERT(1);
+                {
+                    error("SetSysClock failed\n");
                 }
             }
         }