Minor. Added comment and simplified code in KotlinSignatureUtil.

idea/src/org/jetbrains/jet/plugin/codeInsight/ktSignature/KotlinSignatureUtil.java

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2010-2012 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package org.jetbrains.jet.plugin.codeInsight.ktSignature;
 
 import com.intellij.codeInsight.daemon.DaemonCodeAnalyzer;
@@ -27,11 +43,12 @@ class KotlinSignatureUtil {
                                     ? (PsiMethod) element.getOriginalElement()
                                     : (PsiMethod) element;
         if (!annotationOwner.isPhysical()) {
+            // this is fake PsiFile which is mirror for ClsFile without sources
             ASTNode node = SourceTreeToPsiMap.psiElementToTree(element);
             if (node != null) {
                 PsiCompiledElement compiledElement = node.getUserData(ClsElementImpl.COMPILED_ELEMENT);
                 if (compiledElement instanceof PsiMethod) {
-                    annotationOwner = (PsiMethod) compiledElement;
+                    return (PsiMethod) compiledElement;
                 }
             }
         }