Remove dead FIO_FILE_EXISTS flag

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/fio.h b/fio.h
index 86020d9..028ef4c 100644
--- a/fio.h
+++ b/fio.h
@@ -269,10 +269,9 @@
 enum fio_file_flags {
 	FIO_FILE_OPEN		= 1 << 0,	/* file is open */
 	FIO_FILE_CLOSING	= 1 << 1,	/* file being closed */
-	FIO_FILE_EXISTS		= 1 << 2,	/* file there */
-	FIO_FILE_EXTEND		= 1 << 3,	/* needs extend */
-	FIO_FILE_DONE		= 1 << 4,	/* io completed to this file */
-	FIO_SIZE_KNOWN		= 1 << 5,	/* size has been set */
+	FIO_FILE_EXTEND		= 1 << 2,	/* needs extend */
+	FIO_FILE_DONE		= 1 << 3,	/* io completed to this file */
+	FIO_SIZE_KNOWN		= 1 << 4,	/* size has been set */
 };
 
 /*