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/media/libmedia/ToneGenerator.cpp b/media/libmedia/ToneGenerator.cpp
index dfa41c4..6cb10aa 100644
--- a/media/libmedia/ToneGenerator.cpp
+++ b/media/libmedia/ToneGenerator.cpp
@@ -1045,7 +1045,7 @@
 initAudioTrack_exit:
 
     // Cleanup
-    if (mpAudioTrack) {
+    if (mpAudioTrack != NULL) {
         ALOGV("Delete Track I: %p", mpAudioTrack);
         delete mpAudioTrack;
         mpAudioTrack = NULL;