btrfs-progs: mkfs: add break to case BTRFS_COMPRESS_NONE

When compression is null the code always goes through the LZO case,
or prints "lzo support not compiled in".

This bug was added by commit c6d24a3 ("btrfs-progs: mkfs: add lzo
to --compress option").

Pull-request: #967
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

Author: wangmingyu84

mkfs/rootdir.c

@@ -1654,6 +1654,7 @@ int btrfs_mkfs_fill_dir(struct btrfs_trans_handle *trans, const char *source_dir
 
 	switch (compression) {
 	case BTRFS_COMPRESS_NONE:
+                break;
 	case BTRFS_COMPRESS_LZO:
 #if !COMPRESSION_LZO
 		error("lzo support not compiled in");