[PATCH] Fix comment in drivers/block/genhd.c

From: Trivial Patch Monkey <trivial@rustcorp.com.au>

From:  a.othieno@bluewin.ch (Arthur Othieno)

add_gendisk() was replaced with add_disk(), but the comment suggests
otherwise.  Breaks `make *docs'.

drivers/block/genhd.c

@@ -184,7 +184,7 @@ static int exact_lock(dev_t dev, void *data)
 }
 
 /**
- * add_gendisk - add partitioning information to kernel list
+ * add_disk - add partitioning information to kernel list
  * @disk: per-device partitioning information
  *
  * This function registers the partitioning information in @disk