ecryptfs: don't open-code kernel_read()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/ecryptfs/read_write.c b/fs/ecryptfs/read_write.c
index 6a16053..09fe622 100644
--- a/fs/ecryptfs/read_write.c
+++ b/fs/ecryptfs/read_write.c
@@ -232,17 +232,10 @@
 			struct inode *ecryptfs_inode)
 {
 	struct file *lower_file;
-	mm_segment_t fs_save;
-	ssize_t rc;
-
 	lower_file = ecryptfs_inode_to_private(ecryptfs_inode)->lower_file;
 	if (!lower_file)
 		return -EIO;
-	fs_save = get_fs();
-	set_fs(get_ds());
-	rc = vfs_read(lower_file, data, size, &offset);
-	set_fs(fs_save);
-	return rc;
+	return kernel_read(lower_file, offset, data, size);
 }
 
 /**