Fix build warning

Change-Id: I876edc37fb2093ee13c876c2af5c46512763154d
diff --git a/services/audiopolicy/service/AudioPolicyService.cpp b/services/audiopolicy/service/AudioPolicyService.cpp
index fbe4f18..eefff3d 100644
--- a/services/audiopolicy/service/AudioPolicyService.cpp
+++ b/services/audiopolicy/service/AudioPolicyService.cpp
@@ -930,6 +930,7 @@
                 patch2 = ((CreateAudioPatchData *)command2->mParam.get())->mPatch;
             } else {
                 handle2 = ((ReleaseAudioPatchData *)command2->mParam.get())->mHandle;
+                memset(&patch2, 0, sizeof(patch2));
             }
             if (handle != handle2) break;
             /* Filter CREATE_AUDIO_PATCH commands only when they are issued for