corrected typo

Author: tbowmo

libraries/MySensors/MySensor.h

@@ -70,7 +70,7 @@
 
 // Not necessary to include blinking feature if no LED's are defined!
 #if defined(MY_LEDS_BLINKING_FEATURE) && !defined(MY_DEFAULT_RX_LED_PIN) && !defined(MU_DEFAULT_TX_LED_PIN) && !defined(MY_ERR_LED_PIN)
-	#undefine MY_LEDS_BLINKING_FEATURE
+	#undef MY_LEDS_BLINKING_FEATURE
 #endif
 
 // Enable LED BLINKING FEATURE, if there are any LEDs defined.