eeprom_clear example: Set pinMode of LED pin

Author: per1234

libraries/EEPROM/examples/eeprom_clear/eeprom_clear.ino

@@ -11,7 +11,9 @@
 #include <EEPROM.h>
 
 void setup() {
-
+  // initialize the LED pin as an output.
+  pinMode(13, OUTPUT);
+  
   /***
     Iterate through each byte of the EEPROM storage.