blockcheck
rval = checkfs(type, blockcheck(spec), *argv, NULL, NULL);
const char *blockcheck(const char *);
name = blockcheck(fsspec);
int nret = checkfilesys(blockcheck(*argv++), 0, 0L, 0);
path = strdup(blockcheck(*argv));
nret = checkfilesys(blockcheck(snap_dev), path, 0);
int nret = checkfilesys(blockcheck(*argv++), 0, 0L, 0);
device = blockcheck(device);
(name = blockcheck(fsspec))) {