Added @ExpectLoadErrors annotations to test data.

Also, fixed syntax error in AddNullabilitySameJavaType.

compiler/testData/loadJava/kotlinSignature/error/AddingNullability.java

@@ -1,8 +1,10 @@
 package test;
 
 import jet.runtime.typeinfo.KotlinSignature;
+import org.jetbrains.jet.jvm.compiler.annotation.ExpectLoadError;
 
 public class AddingNullability {
+    @ExpectLoadError("Auto type 'jet.Int' is not-null, while type in alternative signature is nullable: 'Int?'")
     @KotlinSignature("fun foo() : Int?")
     public int foo() {
         throw new UnsupportedOperationException();