switch do_fsync() to fget_light()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/sync.c b/fs/sync.c
index 0e8db93..11e3d1c 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -188,11 +188,12 @@
 {
 	struct file *file;
 	int ret = -EBADF;
+	int fput_needed;
 
-	file = fget(fd);
+	file = fget_light(fd, &fput_needed);
 	if (file) {
 		ret = vfs_fsync(file, datasync);
-		fput(file);
+		fput_light(file, fput_needed);
 	}
 	return ret;
 }