[gnome-calculator] GCalc: renamed ErrorExpression to MathErrorExpression

[Daniel Espinosa Ortiz <despinosa src gnome org>]

commit 1e0b36b7636dc6a9d74ba18f9e58a0608e8085fd
Author: Daniel Espinosa <esodan gmail com>
Date:   Thu Oct 17 13:52:59 2019 -0500

    GCalc: renamed ErrorExpression to MathErrorExpression

 gcalc/gcalc-expression.vala      | 4 ++--
 gcalc/gcalc-math-expression.vala | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/gcalc/gcalc-expression.vala b/gcalc/gcalc-expression.vala
index 3e086039..abfd758b 100644
--- a/gcalc/gcalc-expression.vala
+++ b/gcalc/gcalc-expression.vala
@@ -42,7 +42,7 @@ public class GCalc.Expression : Object, MathExpression {
 }
 
 /**
- * An implementation of {@link ErrorExpression}
+ * An implementation of {@link MathErrorExpression}
  */
-public class GCalc.GErrorExpression : Expression, ErrorExpression {}
+public class GCalc.GErrorExpression : Expression, MathErrorExpression {}
 
diff --git a/gcalc/gcalc-math-expression.vala b/gcalc/gcalc-math-expression.vala
index bbcc76d2..2f84f585 100644
--- a/gcalc/gcalc-math-expression.vala
+++ b/gcalc/gcalc-math-expression.vala
@@ -43,6 +43,6 @@ public interface GCalc.MathExpression : Object {
 /**
  * Represent an expression in error condition
  */
-public interface GCalc.ErrorExpression : Object, MathExpression {
+public interface GCalc.MathErrorExpression : Object, MathExpression {
 }