Fix GCC -Wunused-but-set-variable warnings.

src/libespeak-ng/compiledata.c

 	char *p;
 	char c;
 	int keyword;
-	int compiling_tune = 0;
 	int n_tune_names = 0;
 	int done_split;
 	int done_onset = 0;
 		switch (keyword)
 		{
 		case kTUNE:
-			compiling_tune = 1;
 			done_split = 0;
 
 			memcpy(&new_tune, &default_tune, sizeof(TUNE));
 				error("Bad tune name: '%s;", new_tune.name);
 			break;
 		case kENDTUNE:
-			compiling_tune = 0;
-
 			if (done_onset == 0) {
 				new_tune.unstr_start[0] = new_tune.unstr_start[1];
 				new_tune.unstr_end[0] = new_tune.unstr_end[1];

src/libespeak-ng/wave.c

 	return used;
 }
 
-static void start_stream()
+static PaError start_stream()
 {
 	PaError err;
 
 		err = Pa_StartStream(pa_stream);
 	}
 #endif
+
+	return err;
 }
 
 /* This routine will be called by the PortAudio engine when audio is needed.
 #if USE_PORTAUDIO == 18
 		PaDeviceID playbackDevice = Pa_GetDefaultOutputDeviceID();
 
-		PaError err = Pa_OpenStream(&pa_stream,
-		                            // capture parameters
-		                            paNoDevice,
-		                            0,
-		                            paInt16,
-		                            NULL,
-		                            // playback parameters
-		                            playbackDevice,
-		                            out_channels,
-		                            paInt16,
-		                            NULL,
-		                            // general parameters
-		                            wave_samplerate, FRAMES_PER_BUFFER, 0,
-		                            paNoFlag,
-		                            pa_callback, (void *)userdata);
+		err = Pa_OpenStream(&pa_stream,
+		                    // capture parameters
+		                    paNoDevice,
+		                    0,
+		                    paInt16,
+		                    NULL,
+		                    // playback parameters
+		                    playbackDevice,
+		                    out_channels,
+		                    paInt16,
+		                    NULL,
+		                    // general parameters
+		                    wave_samplerate, FRAMES_PER_BUFFER, 0,
+		                    paNoFlag,
+		                    pa_callback, (void *)userdata);
 
 		if (err == paInvalidChannelCount) {
 			// failed to open with mono, try stereo
 			out_channels = 2;
-			PaError err = Pa_OpenStream(&pa_stream,
-			                            // capture parameters
-			                            paNoDevice,
-			                            0,
-			                            paInt16,
-			                            NULL,
-			                            // playback parameters
-			                            playbackDevice,
-			                            out_channels,
-			                            paInt16,
-			                            NULL,
-			                            // general parameters
-			                            wave_samplerate, FRAMES_PER_BUFFER, 0,
-			                            paNoFlag,
-			                            pa_callback, (void *)userdata);
-			err = 0; // avoid warning
+			err = Pa_OpenStream(&pa_stream,
+			                    // capture parameters
+			                    paNoDevice,
+			                    0,
+			                    paInt16,
+			                    NULL,
+			                    // playback parameters
+			                    playbackDevice,
+			                    out_channels,
+			                    paInt16,
+			                    NULL,
+			                    // general parameters
+			                    wave_samplerate, FRAMES_PER_BUFFER, 0,
+			                    paNoFlag,
+			                    pa_callback, (void *)userdata);
 		}
 		mInCallbackFinishedState = false; // v18 only
 #else

src/libespeak-ng/wave_pulse.c

 
 void wave_terminate()
 {
-	int a_status;
 	pthread_mutex_t *a_mutex = NULL;
 	a_mutex = &pulse_mutex;
-	a_status = pthread_mutex_lock(a_mutex);
+	pthread_mutex_lock(a_mutex);
 
 	pulse_close();
 
-	a_status = pthread_mutex_unlock(a_mutex);
+	pthread_mutex_unlock(a_mutex);
 	pthread_mutex_destroy(a_mutex);
 }