Keep the jclass reference inside a scope to prevent

duplicate definition error when multiple variables of the same struct
type are present.

Author: pidarped

src/controller/java/templates/partials/decode_value.zapt

@@ -31,11 +31,13 @@ if ({{source}}.IsNull()) {
       {{>decode_value target=(concat ../target "_" (asLowerCamelCase label)) source=(concat ../source "." (asLowerCamelCase label)) cluster=../cluster depth=(incrementDepth ../depth) omitDeclaration=false earlyReturn=../earlyReturn}}
     {{/zcl_struct_items_by_struct_and_cluster_name}}
 
-    jclass {{asLowerCamelCase type}}StructClass_{{depth}};
-    err = chip::JniReferences::GetInstance().GetLocalClassRef(env, "chip/devicecontroller/ChipStructs${{asUpperCamelCase cluster}}Cluster{{asUpperCamelCase type}}", {{asLowerCamelCase type}}StructClass_{{depth}});
-    if (err != CHIP_NO_ERROR) {
-      ChipLogError(Zcl, "Could not find class ChipStructs${{asUpperCamelCase cluster}}Cluster{{asUpperCamelCase type}}");
-      return {{earlyReturn}};
+    {
+      jclass {{asLowerCamelCase type}}StructClass_{{depth}};
+      err = chip::JniReferences::GetInstance().GetLocalClassRef(env, "chip/devicecontroller/ChipStructs${{asUpperCamelCase cluster}}Cluster{{asUpperCamelCase type}}", {{asLowerCamelCase type}}StructClass_{{depth}});
+      if (err != CHIP_NO_ERROR) {
+        ChipLogError(Zcl, "Could not find class ChipStructs${{asUpperCamelCase cluster}}Cluster{{asUpperCamelCase type}}");
+        return {{earlyReturn}};
+      }
     }
 
     jmethodID {{asLowerCamelCase type}}StructCtor_{{depth}};