Fix minor compile warnings

plugins/android-extensions/android-extensions-idea/src/org/jetbrains/kotlin/AndroidExtensionsReferenceSearchExecutor.kt

@@ -37,6 +37,7 @@ class AndroidExtensionsReferenceSearchExecutor : QueryExecutorBase<PsiReference,
     override fun processQuery(queryParameters: ReferencesSearch.SearchParameters, consumer: Processor<in PsiReference>) {
         val elementToSearch = queryParameters.elementToSearch as? XmlAttributeValue ?: return
         val scopeElements = (queryParameters.effectiveSearchScope as? LocalSearchScope)?.scope ?: return
+        @Suppress("UNNECESSARY_SAFE_CALL", "USELESS_ELVIS") // BUNCH: 182
         val referenceName = elementToSearch.value?.substringAfterLast("/") ?: return
 
         scopeElements.filterIsInstance<KtElement>().forEach {

plugins/android-extensions/android-extensions-idea/src/org/jetbrains/kotlin/android/synthetic/idea/AndroidSimpleNameReferenceExtension.kt

@@ -33,7 +33,7 @@ class AndroidSimpleNameReferenceExtension : SimpleNameReferenceExtension {
             element is XmlFile && reference.isReferenceToXmlFile(element)
 
     private fun isLayoutPackageIdentifier(reference: KtSimpleNameReference): Boolean {
-        val probablyVariant = reference.element?.parent as? KtDotQualifiedExpression ?: return false
+        val probablyVariant = reference.element.parent as? KtDotQualifiedExpression ?: return false
         val probablyKAS = probablyVariant.receiverExpression as? KtDotQualifiedExpression ?: return false
         return probablyKAS.receiverExpression.text == AndroidConst.SYNTHETIC_PACKAGE
     }
@@ -51,6 +51,7 @@ class AndroidSimpleNameReferenceExtension : SimpleNameReferenceExtension {
         return null
     }
 
+    @Suppress("UNNECESSARY_SAFE_CALL", "USELESS_ELVIS") // BUNCH: 182
     private fun isIdDeclaration(declaration: XmlAttributeValue) = declaration.value?.startsWith("@+id/") ?: false
 
     private fun KtSimpleNameReference.isReferenceToXmlFile(xmlFile: XmlFile): Boolean {

plugins/android-extensions/android-extensions-idea/tests/org/jetbrains/kotlin/android/AbstractAndroidFindUsagesTest.kt

@@ -19,6 +19,7 @@ package org.jetbrains.kotlin.android
 
 abstract class AbstractAndroidFindUsagesTest : KotlinAndroidTestCase() {
 
+    @Suppress("UNREACHABLE_CODE")
     fun doTest(path: String) {
         return // TODO: investigate and fix this test
         copyResourceDirectoryForTest(path)