x86: Remove weird PTR_ERR() in do_debug
x86: Remove weird PTR_ERR() in do_debug

62edab905 changed the argument to notify_die() from dr6 to &dr6,
but weirdly, used PTR_ERR() to cast it to a long.  Since dr6 is
on the stack, this is an abuse of PTR_ERR().  Cast to long, as
per kernel standard.

Signed-off-by: Rusty Russell <df9728c9e5104131c08c7adb03af425394842596@rustcorp.com.au>
Cc: K.Prasad <d7fbabb3289b145a0f256d6596e2e43e9ecb9986@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/1371357768-4968-8-git-send-email-df9728c9e5104131c08c7adb03af425394842596@rustcorp.com.au
Signed-off-by: Ingo Molnar <9dbbbf0688fedc85ad4da37637f1a64b8c718ee2@kernel.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs