switch simple generic_file_aio_read() users to ->read_iter()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 063fc15..8813942 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -593,9 +593,9 @@
 
 const struct file_operations ext4_file_operations = {
 	.llseek		= ext4_llseek,
-	.read		= do_sync_read,
+	.read		= new_sync_read,
 	.write		= do_sync_write,
-	.aio_read	= generic_file_aio_read,
+	.read_iter	= generic_file_read_iter,
 	.aio_write	= ext4_file_write,
 	.unlocked_ioctl = ext4_ioctl,
 #ifdef CONFIG_COMPAT