Staging: vt6655: Remove do { } while (0) from single-statement macros in upc.h.

This patch fixes checkpatch.pl warnings in upc.h regarding single-statement macros
embedded within do { } while (0) blocks.

Signed-off-by: Nicholas Parkanyi <n.parkanyi@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>