Remove a check in room() for (_begin == _end). It's covered by the (_end >= _begin) case.

Author: alltheblinkythings

cores/esp8266/cbuf.h

@@ -42,9 +42,6 @@ class cbuf {
             if(_end >= _begin) {
                 return _size - (_end - _begin) - 1;
             }
-            if(_begin == _end) {
-                return _size;
-            }
             return _begin - _end - 1;
         }