The character sequence ??) is a trigraph and causes the following
clang warning:

drivers/atm/idt77252.c:3544:35: warning: trigraph ignored [-Wtrigraphs]

Clean this by replacing it with single ?.
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>