block: Use bool as appropriate for BDS members

Using int for values that are only used as booleans is confusing.
While at it, rearrange a couple of members so that all the bools
are contiguous.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

block/cloop.c

@@ -66,7 +66,7 @@ static int cloop_open(BlockDriverState *bs, QDict *options, int flags,
     uint32_t offsets_size, max_compressed_block_size = 1, i;
     int ret;
 
-    bs->read_only = 1;
+    bs->read_only = true;
 
     /* read header */
     ret = bdrv_pread(bs->file->bs, 128, &s->block_size, 4);