NFSv4: Ensure that we pass the correct dentry to nfs4_intent_set_file

This patch fixes an Oops that was reported by Gabriel Barazer.

Signed-off-by: Trond Myklebust <[e-mail]>

fs/nfs/nfs4proc.c

···
 	}
 	res = d_add_unique(dentry, igrab(state->inode));
 	if (res != NULL)
-		dentry = res;
+		path.dentry = res;
 	nfs4_intent_set_file(nd, &path, state);
 	return res;
 }