AudioRecord::stop() returns void

like AudioTrack::stop()

Change-Id: I31015fee8bb8bf1650cc55b6e3f77b55e81c13cc
diff --git a/srec_jni/android_speech_srec_MicrophoneInputStream.cpp b/srec_jni/android_speech_srec_MicrophoneInputStream.cpp
index 7cb56bb..1a48ab9 100644
--- a/srec_jni/android_speech_srec_MicrophoneInputStream.cpp
+++ b/srec_jni/android_speech_srec_MicrophoneInputStream.cpp
@@ -94,9 +94,7 @@
 
 static JNIEXPORT void JNICALL Java_android_speech_srec_Recognizer_AudioRecordStop
         (JNIEnv *env, jclass clazz, jint audioRecord) {
-    if (int rtn = ((AudioRecord*)audioRecord)->stop()) {
-        throwException(env, "java/io/IOException", "AudioRecord::stop failed %d", rtn);
-    }
+    ((AudioRecord*)audioRecord)->stop();
 }
 
 static JNIEXPORT void JNICALL Java_android_speech_srec_Recognizer_AudioRecordDelete