Fixed compilation. toArray → copyToArray

idea/src/org/jetbrains/jet/plugin/highlighter/KotlinSuppressableWarningProblemGroup.kt

@@ -41,8 +41,7 @@ class KotlinSuppressableWarningProblemGroup(
         if (element == null)
             return SuppressIntentionAction.EMPTY_ARRAY
 
-        val actions = createSuppressWarningActions(element, diagnosticFactory)
-        return actions.toArray(Array<SuppressIntentionAction?>(actions.size) {null}) as Array<SuppressIntentionAction>
+        return createSuppressWarningActions(element, diagnosticFactory).copyToArray()
     }
 
 }
@@ -110,4 +109,4 @@ private object DeclarationKindDetector : JetVisitor<AnnotationHostKind?, Unit?>(
 
     private fun detect(declaration: JetDeclaration, kind: String, name: String = declaration.getName() ?: "<anonymous>", newLineNeeded: Boolean = true)
         = AnnotationHostKind(kind, name, newLineNeeded)
-}
+}