ceph: fix sparse endian warning

Use the __le macro, even though for -1 it doesn't matter.
Signed-off-by: Sage Weil <sage@newdream.net>

fs/ceph/file.c

@@ -52,7 +52,7 @@ prepare_open_request(struct super_block *sb, int flags, int create_mode)
 	req->r_fmode = ceph_flags_to_mode(flags);
 	req->r_args.open.flags = cpu_to_le32(flags);
 	req->r_args.open.mode = cpu_to_le32(create_mode);
-	req->r_args.open.preferred = -1;
+	req->r_args.open.preferred = cpu_to_le32(-1);
 out:
 	return req;
 }

fs/ceph/super.c

@@ -804,7 +804,7 @@ static int ceph_get_sb(struct file_system_type *fs_type,
 	struct ceph_client *client;
 	int err;
 	int (*compare_super)(struct super_block *, void *) = ceph_compare_super;
-	const char *path = 0;
+	const char *path = NULL;
 	struct ceph_mount_args *args;
 
 	dout("ceph_get_sb\n");