Simplify DefIncrement and DefDecrement borrow checking

For some reason, this *definitely* required an extra scope before, but
doesn't seem to now...

Author: IsaacWoods

aml/src/expression.rs

@@ -331,10 +331,7 @@ where
             DebugVerbosity::AllScopes,
             "DefIncrement",
             super_name().map_with_context(|addend, context| {
-                let value = {
-                    let value = try_with_context!(context, context.read_target(&addend));
-                    value.clone()
-                };
+                let value = try_with_context!(context, context.read_target(&addend)).clone();
                 let value = try_with_context!(context, value.as_integer(context));
                 let new_value = AmlValue::Integer(value + 1);
                 try_with_context!(context, context.store(addend, new_value.clone()));
@@ -356,10 +353,7 @@ where
             DebugVerbosity::AllScopes,
             "DefDecrement",
             super_name().map_with_context(|minuend, context| {
-                let value = {
-                    let value = try_with_context!(context, context.read_target(&minuend));
-                    value.clone()
-                };
+                let value = try_with_context!(context, context.read_target(&minuend)).clone();
                 let value = try_with_context!(context, value.as_integer(context));
                 let new_value = AmlValue::Integer(value - 1);
                 try_with_context!(context, context.store(minuend, new_value.clone()));