locking/jump_labels: Update bug_at() boot message

locking/jump_labels: Update bug_at() boot message

First of all, %*ph specifier allows to dump data in hex format using the
pointer to a buffer. This is suitable to use here.

Besides that Thomas suggested to move it to critical level and replace __FILE__
by explicit mention of "jumplabel".

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20170110164354.47372-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>