NFS: Get rid of unnecessary calls to ClearPageError() in read code

The generic file read code does that for us anyway.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/read.c

@@ -322,7 +322,6 @@ static int nfs_pagein_multi(struct nfs_pageio_descriptor *desc, struct list_head
 		offset += len;
 	} while(nbytes != 0);
 	atomic_set(&req->wb_complete, requests);
-	ClearPageError(page);
 	desc->pg_rpc_callops = &nfs_read_partial_ops;
 	return ret;
 out_bad:
@@ -357,7 +356,6 @@ static int nfs_pagein_one(struct nfs_pageio_descriptor *desc, struct list_head *
 		req = nfs_list_entry(head->next);
 		nfs_list_remove_request(req);
 		nfs_list_add_request(req, &data->pages);
-		ClearPageError(req->wb_page);
 		*pages++ = req->wb_page;
 	}
 	req = nfs_list_entry(data->pages.next);

fs/nfs/write.c

@@ -1011,7 +1011,6 @@ static int nfs_flush_one(struct nfs_pageio_descriptor *desc, struct list_head *r
 		req = nfs_list_entry(head->next);
 		nfs_list_remove_request(req);
 		nfs_list_add_request(req, &data->pages);
-		ClearPageError(req->wb_page);
 		*pages++ = req->wb_page;
 	}
 	req = nfs_list_entry(data->pages.next);