Unnecessary check in jsonsl_util_unescape_ex
Unnecessary check in jsonsl_util_unescape_ex

By the time JSONSL checks if a u-escape value is less than 0xDC00, it
already knows it is greater than 0xD7FF.
mnunberg/jsonsl,snej/jsonsl,snej/jsonsl,mnunberg/jsonsl,snej/jsonsl,snej/jsonsl,mnunberg/jsonsl,mnunberg/jsonsl