switch open-coded instances of d_make_root() to new helper

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/qnx4/inode.c b/fs/qnx4/inode.c
index 6b00954..db18d86 100644
--- a/fs/qnx4/inode.c
+++ b/fs/qnx4/inode.c
@@ -260,15 +260,13 @@
  	}
 
 	ret = -ENOMEM;
- 	s->s_root = d_alloc_root(root);
+ 	s->s_root = d_make_root(root);
  	if (s->s_root == NULL)
- 		goto outi;
+ 		goto outb;
 
 	brelse(bh);
 	return 0;
 
-      outi:
-	iput(root);
       outb:
 	kfree(qs->BitMap);
       out: