delete reference to vApplicationMallocFailedHook()

Deleted redundant call to `vApplicationMallocFailedHook()`.

As per [Richard's suggestion](vApplicationMallocFailedHook();).

Author: feilipu

src/variantHooks.cpp

@@ -51,10 +51,7 @@ void initVariant(void)
 #endif
 
 	setup();		// the normal Arduino setup() function is run here.
-
 	vTaskStartScheduler(); // initialise and run the freeRTOS scheduler. Execution should never return here.
-
-	vApplicationMallocFailedHook(); // Probably we've failed trying to initialise heap for the scheduler. Let someone know.
 }