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/sysv/inode.c b/fs/sysv/inode.c
index 3da5ce2..08d0b25 100644
--- a/fs/sysv/inode.c
+++ b/fs/sysv/inode.c
@@ -316,7 +316,7 @@
 		sysv_truncate(inode);
 	}
 	invalidate_inode_buffers(inode);
-	end_writeback(inode);
+	clear_inode(inode);
 	if (!inode->i_nlink)
 		sysv_free_inode(inode);
 }