NFS: Clean up the callers of nfs_wb_all()

There is no need to flush out writes before calling nfs_wb_all().

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index ec7a8f9..581d8f0 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -413,10 +413,8 @@
 		return 0;
 
 	/* Write all dirty data */
-	if (S_ISREG(inode->i_mode)) {
-		filemap_write_and_wait(inode->i_mapping);
+	if (S_ISREG(inode->i_mode))
 		nfs_wb_all(inode);
-	}
 
 	fattr = nfs_alloc_fattr();
 	if (fattr == NULL)