Use String8/16 c_str [audio]

Bug: 295394788
Test: make checkbuild
Change-Id: Idd3610f6820093bd8710a401f87a136cc26279c5
diff --git a/media/libaudioclient/AudioSystem.cpp b/media/libaudioclient/AudioSystem.cpp
index 763de70..e815190 100644
--- a/media/libaudioclient/AudioSystem.cpp
+++ b/media/libaudioclient/AudioSystem.cpp
@@ -87,7 +87,7 @@
 void AudioSystem::setAudioFlingerBinder(const sp<IBinder>& audioFlinger) {
     if (audioFlinger->getInterfaceDescriptor() != media::IAudioFlingerService::descriptor) {
         ALOGE("setAudioFlingerBinder: received a binder of type %s",
-              String8(audioFlinger->getInterfaceDescriptor()).string());
+              String8(audioFlinger->getInterfaceDescriptor()).c_str());
         return;
     }
     Mutex::Autolock _l(gLock);