Follow raw pointer and sp<> conventions

Unconditional delete for raw pointers.
Use "if (sp != 0)" not "if (sp.get() != 0)" or "if (sp != NULL)".
Use "if (raw != NULL)" not "if (raw)".

Change-Id: I531a8da7c37149261ed2f34b862ec4896a4b785b
diff --git a/core/jni/android_media_ToneGenerator.cpp b/core/jni/android_media_ToneGenerator.cpp
index aabb778..0a337fa 100644
--- a/core/jni/android_media_ToneGenerator.cpp
+++ b/core/jni/android_media_ToneGenerator.cpp
@@ -72,9 +72,7 @@
 
     env->SetIntField(thiz, fields.context, 0);
 
-    if (lpToneGen) {
-        delete lpToneGen;
-    }
+    delete lpToneGen;
 }
 
 static void android_media_ToneGenerator_native_setup(JNIEnv *env, jobject thiz,