If the buffer given to the ucc interrupt handler is too long, do not

If the buffer given to the ucc interrupt handler is too long, do not
discard it but instead just inspect the first bytes that can make up a
usage. This is a work around as the correct solution is to only inspect
a limited number of bits as given by the report count and size
associated with the Consumer usage page.

Final piece to get florian@'s Microsoft Sculpt keyboard working.