NFS: Clean up reset of the mirror accounting variables

Now that nfs_pageio_do_add_request() resets the pg_count, we don't need
these other inlined resets.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

fs/nfs/pagelist.c

@@ -1132,12 +1132,8 @@ static void nfs_pageio_doio(struct nfs_pageio_descriptor *desc)
 		int error = desc->pg_ops->pg_doio(desc);
 		if (error < 0)
 			desc->pg_error = error;
-		if (list_empty(&mirror->pg_list)) {
+		if (list_empty(&mirror->pg_list))
 			mirror->pg_bytes_written += mirror->pg_count;
-			mirror->pg_count = 0;
-			mirror->pg_base = 0;
-			mirror->pg_recoalesce = 0;
-		}
 	}
 }
 
@@ -1227,9 +1223,6 @@ static int nfs_do_recoalesce(struct nfs_pageio_descriptor *desc)
 
 	do {
 		list_splice_init(&mirror->pg_list, &head);
-		mirror->pg_count = 0;
-		mirror->pg_base = 0;
-		mirror->pg_recoalesce = 0;
 
 		while (!list_empty(&head)) {
 			struct nfs_page *req;