nfs: Use PTR_ERR_OR_ZERO in 'nfs/nfs4super.c'

Use 'PTR_ERR_OR_ZERO()' rather than 'IS_ERR(...) ? PTR_ERR(...) : 0'.
Signed-off-by: Geyslan G. Bem <geyslan@gmail.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

fs/nfs/nfs4super.c

@@ -261,8 +261,8 @@ struct dentry *nfs4_try_mount(int flags, const char *dev_name,
 
 	res = nfs_follow_remote_path(root_mnt, export_path);
 
-	dfprintk(MOUNT, "<-- nfs4_try_mount() = %ld%s\n",
-			IS_ERR(res) ? PTR_ERR(res) : 0,
+	dfprintk(MOUNT, "<-- nfs4_try_mount() = %d%s\n",
+		 PTR_ERR_OR_ZERO(res),
 		 IS_ERR(res) ? " [error]" : "");
 	return res;
 }
@@ -319,8 +319,8 @@ static struct dentry *nfs4_referral_mount(struct file_system_type *fs_type,
 	data->mnt_path = export_path;
 
 	res = nfs_follow_remote_path(root_mnt, export_path);
-	dprintk("<-- nfs4_referral_mount() = %ld%s\n",
-			IS_ERR(res) ? PTR_ERR(res) : 0,
+	dprintk("<-- nfs4_referral_mount() = %d%s\n",
+		PTR_ERR_OR_ZERO(res),
 		IS_ERR(res) ? " [error]" : "");
 	return res;
 }