vfs: Rename end_writeback() to clear_inode()

After we moved inode_sync_wait() from end_writeback() it doesn't make sense
to call the function end_writeback() anymore. Rename it to clear_inode()
which well says what the function really does - set I_CLEAR flag.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 76e4e05..7bf60ae 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -378,7 +378,7 @@
 		smp_wmb();
 	}
 done:
-	end_writeback(inode);
+	clear_inode(inode);
 }
 
 static void ubifs_dirty_inode(struct inode *inode, int flags)