uml: fixup allocation in the ubd driver

Sanitise gfp flags; it actually is an atomic context, so drop the
GFP_KERNEL part.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/um/drivers/ubd_kern.c

@@ -1102,7 +1102,7 @@ static void do_ubd_request(request_queue_t *q)
 			struct scatterlist *sg = &dev->sg[dev->start_sg];
 
 			io_req = kmalloc(sizeof(struct io_thread_req),
-					 GFP_KERNEL | GFP_ATOMIC);
+					 GFP_ATOMIC);
 			if(io_req == NULL){
 				if(list_empty(&dev->restart))
 					list_add(&dev->restart, &restart);