fix: add missing null check in codegen for classes generated by jadx

jadx-core/src/main/java/jadx/core/codegen/utils/CodeGenUtils.java

@@ -140,7 +140,9 @@ public class CodeGenUtils {
 			String inputFileName = cls.getClsData().getInputFileName();
 			if (inputFileName != null) {
 				ClassNode declCls = cls.getDeclaringClass();
-				if (declCls != null && inputFileName.equals(declCls.getClsData().getInputFileName())) {
+				if (declCls != null
+						&& declCls.getClsData() != null
+						&& inputFileName.equals(declCls.getClsData().getInputFileName())) {
 					// don't add same comment for inner classes
 					return;
 				}

jadx-core/src/main/java/jadx/core/dex/nodes/ClassNode.java

@@ -864,7 +864,12 @@ public class ClassNode extends NotificationAttrNode
 		}
 	}
 
-	public IClassData getClsData() {
+	/**
+	 * Low level class data access.
+	 *
+	 * @return null for classes generated by jadx
+	 */
+	public @Nullable IClassData getClsData() {
 		return clsData;
 	}