block: remove remaining __FUNCTION__ occurrences

__FUNCTION__ is gcc specific, use __func__

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/block/blk-barrier.c b/block/blk-barrier.c
index 66e5528..a09ead1 100644
--- a/block/blk-barrier.c
+++ b/block/blk-barrier.c
@@ -26,8 +26,7 @@
 {
 	if (ordered & (QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH) &&
 	    prepare_flush_fn == NULL) {
-		printk(KERN_ERR "%s: prepare_flush_fn required\n",
-								__FUNCTION__);
+		printk(KERN_ERR "%s: prepare_flush_fn required\n", __func__);
 		return -EINVAL;
 	}