f2fs: clear append/update flags once fsync is done

When fsync is done through checkpoint, previous f2fs missed to clear append
and update flag. This patch fixes to clear them.

This was originally catched by Changman Lee before.
Signed-off-by: NChangman Lee <cm224.lee@samsung.com>
Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/file.c

@@ -241,6 +241,8 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
 		 * will be used only for fsynced inodes after checkpoint.
 		 */
 		try_to_fix_pino(inode);
+		clear_inode_flag(fi, FI_APPEND_WRITE);
+		clear_inode_flag(fi, FI_UPDATE_WRITE);
 		goto out;
 	}
 sync_nodes: