Update calls to IInterface::asBinder()

to use the new static version.

Change-Id: I89a5988a0ac694ffc04d88cf939e8455bf925d4c
diff --git a/media/libmedia/IDrm.cpp b/media/libmedia/IDrm.cpp
index 7e74de9..b08fa82 100644
--- a/media/libmedia/IDrm.cpp
+++ b/media/libmedia/IDrm.cpp
@@ -450,7 +450,7 @@
     virtual status_t setListener(const sp<IDrmClient>& listener) {
         Parcel data, reply;
         data.writeInterfaceToken(IDrm::getInterfaceDescriptor());
-        data.writeStrongBinder(listener->asBinder());
+        data.writeStrongBinder(IInterface::asBinder(listener));
         remote()->transact(SET_LISTENER, data, &reply);
         return reply.readInt32();
     }