coda: switch coda_cnode_make() to sane API as well, clean coda_lookup()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/coda/inode.c b/fs/coda/inode.c
index 1c08a8c..5e2e1b3 100644
--- a/fs/coda/inode.c
+++ b/fs/coda/inode.c
@@ -204,10 +204,12 @@
 	printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
 	
 	/* make root inode */
-        error = coda_cnode_make(&root, &fid, sb);
-        if ( error || !root ) {
-	    printk("Failure of coda_cnode_make for root: error %d\n", error);
-	    goto error;
+        root = coda_cnode_make(&fid, sb);
+        if (IS_ERR(root)) {
+		error = PTR_ERR(root);
+		printk("Failure of coda_cnode_make for root: error %d\n", error);
+		root = NULL;
+		goto error;
 	} 
 
 	printk("coda_read_super: rootinode is %ld dev %s\n",