Trivial refactoring: extract variable

(cherry picked from commit c4a4754)

Author: daniellansun

src/main/java/org/codehaus/groovy/classgen/asm/sc/StaticTypesLambdaWriter.java

@@ -294,8 +294,9 @@ private Parameter[] createParametersWithExactType(final LambdaExpression express
         Parameter[] lambdaParameters = getParametersSafe(expression);
         ClassNode[] lambdaParamTypes = expression.getNodeMetaData(StaticTypesMarker.CLOSURE_ARGUMENTS);
         for (int i = 0, n = lambdaParameters.length; i < n; i += 1) {
-            ClassNode resolvedType = convertParameterType(targetParameters[i].getType(), lambdaParameters[i].getType(), lambdaParamTypes[i]);
-            lambdaParameters[i].setType(resolvedType);
+            final Parameter lambdaParameter = lambdaParameters[i];
+            ClassNode resolvedType = convertParameterType(targetParameters[i].getType(), lambdaParameter.getType(), lambdaParamTypes[i]);
+            lambdaParameter.setType(resolvedType);
         }
         return lambdaParameters;
     }