Fix leak in _fileio.c (patch by Hirokazu Yamamoto)
diff --git a/Modules/_fileio.c b/Modules/_fileio.c
index c6b97fb..c3124db 100644
--- a/Modules/_fileio.c
+++ b/Modules/_fileio.c
@@ -622,6 +622,7 @@
 		n = -1;
 
 	if (n < 0) {
+		Py_DECREF(bytes);
 		if (errno == EAGAIN)
 			Py_RETURN_NONE;
 		PyErr_SetFromErrno(PyExc_IOError);