lib/test_printf: Mark big constant with UL

lib/test_printf: Mark big constant with UL

Sparse complains that constant is so big for unsigned long on 64-bit
architecture.

lib/test_printf.c:217:54: warning: constant 0xffff0123456789ab is so big it is unsigned long
lib/test_printf.c:246:54: warning: constant 0xffff0123456789ab is so big it is unsigned long

To satisfy everyone, mark the constant with UL.

Link: http://lkml.kernel.org/r/20180216210711.79901-1-andriy.shevchenko@linux.intel.com
To: "Tobin C . Harding" <me@tobin.cc>
To: linux@rasmusvillemoes.dk
To: Joe Perches <joe@perches.com>
To: linux-kernel@vger.kernel.org
To: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
[pmladek@suse.com: Changed from ULL to UL as suggested by Luc Van Oostenryck <luc.vanoostenryck@gmail.com>]
Signed-off-by: Petr Mladek <pmladek@suse.com>