Desktop: fix build error

libraries/Desktop/support/DataFlash_APM1.cpp

@@ -123,4 +123,4 @@ void DataFlash_APM1::ChipErase(void (*delay_cb)(unsigned long))
 }
 
 // make one instance for the user to use
-DataFlash_APM1::DataFlash_APM1() {}
+DataFlash_APM1::DataFlash_APM1(AP_Semaphore* spi_semaphore) {}