Return value for readEEPROM

uint16_t  TMP117::readEEPROM (uint8_t eeprom_nr) doesn't have an explicity return in the event that the EEPROM is busy. This makes newer compilers throw errors. 0 seems to be the most innocent return value, but maybe the max uint16 might be better?

Author: tcirstea

src/TMP117.cpp

@@ -286,6 +286,7 @@ uint16_t  TMP117::readEEPROM (uint8_t eeprom_nr) {
   }
   else {
     Serial.println("EEPROM is busy");
+    return 0;
   }
 }