CDRIVER-2179 unnecessary check
CDRIVER-2179 unnecessary check

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

mongodb/libbson,ajdavis/libbson,mongodb/libbson,mapr/libbson,rcsanchez97/libbson,mapr/libbson,ajdavis/libbson,ajdavis/libbson,mongodb/libbson,rcsanchez97/libbson,mapr/libbson,rcsanchez97/libbson