extra: handle loops where without a hard max that don't have a break

extra: handle loops where without a hard max that don't have a break

If the loop doesn't have a hard max, then the value after the loop is
unknown-ish the same as it was before.  If we have a break statement this
works already, but if we don't then this was setting it to the max.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>