staging: ti dspbridge: fix compilation error

This patch fix a compilation error in uuid_hex_to_bin
due to the patch "simplify and clean up"

Signed-off-by: Rene Sapiens <rene.sapiens@ti.com>
Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>