Revert "nfs: take extra reference to fl->fl_file when running a LOCKU operation"

This reverts commit ed7f7f14.

Reverting from stable tree as fix was found to be buggy. New fix pending.
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

fs/nfs/nfs4proc.c

@@ -5356,7 +5356,6 @@ static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
 	atomic_inc(&lsp->ls_count);
 	/* Ensure we don't close file until we're done freeing locks! */
 	p->ctx = get_nfs_open_context(ctx);
-	get_file(fl->fl_file);
 	memcpy(&p->fl, fl, sizeof(p->fl));
 	p->server = NFS_SERVER(inode);
 	return p;
@@ -5368,7 +5367,6 @@ static void nfs4_locku_release_calldata(void *data)
 	nfs_free_seqid(calldata->arg.seqid);
 	nfs4_put_lock_state(calldata->lsp);
 	put_nfs_open_context(calldata->ctx);
-	fput(calldata->fl.fl_file);
 	kfree(calldata);
 }