nfs: remove some dead code in ff_layout_pg_get_mirror_count_write

We already know that pg_lseg is NULL here.

Signed-off-by: Jeff Layton <[e-mail]>
Signed-off-by: Trond Myklebust <[e-mail]>

fs/nfs/flexfilelayout/flexfilelayout.c

···
 		return FF_LAYOUT_MIRROR_COUNT(pgio->pg_lseg);
 
 	/* no lseg means that pnfs is not in use, so no mirroring here */
-	pnfs_put_lseg(pgio->pg_lseg);
-	pgio->pg_lseg = NULL;
 	nfs_pageio_reset_write_mds(pgio);
 	return 1;
 }