writeback: fix fn name in writeback_inodes_sb_nr_if_idle() comment header

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index f855916..82e959d 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -1284,7 +1284,7 @@
 EXPORT_SYMBOL(writeback_inodes_sb_if_idle);
 
 /**
- * writeback_inodes_sb_if_idle	-	start writeback if none underway
+ * writeback_inodes_sb_nr_if_idle	-	start writeback if none underway
  * @sb: the superblock
  * @nr: the number of pages to write
  * @reason: reason why some writeback work was initiated