fix some warnings

vendor/freertos/FreeRTOSConfig_cm4f.h

@@ -145,7 +145,7 @@ to all Cortex-M ports, and do not rely on any particular library functions. */
 /* !!!! configMAX_SYSCALL_INTERRUPT_PRIORITY must not be set to zero !!!!
 See http://www.FreeRTOS.org/RTOS-Cortex-M3-M4.html. */
 #define configMAX_SYSCALL_INTERRUPT_PRIORITY 	( configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY << (8 - configPRIO_BITS) )
-	
+
 /* Normal assert() semantics without relying on the provision of an assert.h
 header file. */
 #define configASSERT( x ) if( ( x ) == 0 ) { taskDISABLE_INTERRUPTS(); hal_debugger_breakpoint(); }