Remove leftover debug code

Author: earlephilhower

cores/esp8266/spiffs_api.h

@@ -356,8 +356,6 @@ class SPIFFSImpl : public FSImpl
     std::unique_ptr<uint8_t[]> _cacheBuf;
 
     SPIFFSConfig _cfg;
-
-    int _called = 0;
 };
 
 #define CHECKFD() while (_fd == 0) { panic(); }