[fractal] API: move derror macro from util.rs to error.rs

[Daniel Garcia Moreno <danigm src gnome org>]

commit 5a867d3ace12f35e2a2bf1bd07cb176199c8ee31
Author: Alejandro Domínguez <adomu net-c com>
Date:   Tue Mar 10 12:36:02 2020 +0100

    API: move derror macro from util.rs to error.rs

 fractal-matrix-api/src/error.rs | 11 +++++++++++
 fractal-matrix-api/src/util.rs  | 11 -----------
 2 files changed, 11 insertions(+), 11 deletions(-)
---
diff --git a/fractal-matrix-api/src/error.rs b/fractal-matrix-api/src/error.rs
index ff3f177a..4412b6f7 100644
--- a/fractal-matrix-api/src/error.rs
+++ b/fractal-matrix-api/src/error.rs
@@ -4,6 +4,17 @@ use std::time::SystemTimeError;
 
 use serde_json::Value as JsonValue;
 
+#[macro_export]
+macro_rules! derror {
+    ($from: path, $to: path) => {
+        impl From<$from> for Error {
+            fn from(_: $from) -> Error {
+                $to
+            }
+        }
+    };
+}
+
 #[derive(Debug)]
 pub enum Error {
     BackendError,
diff --git a/fractal-matrix-api/src/util.rs b/fractal-matrix-api/src/util.rs
index 1ce07360..89fc2108 100644
--- a/fractal-matrix-api/src/util.rs
+++ b/fractal-matrix-api/src/util.rs
@@ -89,17 +89,6 @@ macro_rules! clone {
     );
 }
 
-#[macro_export]
-macro_rules! derror {
-    ($from: path, $to: path) => {
-        impl From<$from> for Error {
-            fn from(_: $from) -> Error {
-                $to
-            }
-        }
-    };
-}
-
 #[macro_export]
 macro_rules! bkerror2 {
     ($result: expr, $tx: ident, $type: expr) => {