Fix up CFQ scheduler for recent rbtree node shrinkage

The color is now in the low bits of the parent pointer, and initializing
it to 0 happens as part of the whole memset above, so just remove the
unnecessary RB_CLEAR_COLOR.
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

block/cfq-iosched.c

@@ -1318,7 +1318,6 @@ cfq_alloc_io_context(struct cfq_data *cfqd, gfp_t gfp_mask)
 
 	if (cic) {
 		memset(cic, 0, sizeof(*cic));
-		RB_CLEAR_COLOR(&cic->rb_node);
 		cic->last_end_request = jiffies;
 		INIT_LIST_HEAD(&cic->queue_list);
 		cic->dtor = cfq_free_io_context;