Let espeak/espeak-ng choose the buffer size.
See https://github.com/williamh/espeakup/issues/13
Avoids https://github.com/espeak-ng/espeak-ng/issues/772

---
 espeak.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/espeak.c
+++ b/espeak.c
@@ -304,7 +304,7 @@ static void reinitialize_espeak(struct s
 	int rate;
 
 	/* Re-initialize espeak */
-	rate = espeak_Initialize(AUDIO_OUTPUT_PLAYBACK, 50, NULL, 0);
+	rate = espeak_Initialize(AUDIO_OUTPUT_PLAYBACK, 0, NULL, 0);
 	if (rate < 0) {
 		fprintf(stderr, "Unable to initialize espeak.\n");
 		return;
@@ -387,7 +387,7 @@ int initialize_espeak(struct synth_t *s)
 	int rate;
 
 	/* initialize espeak */
-	rate = espeak_Initialize(AUDIO_OUTPUT_PLAYBACK, 50, NULL, 0);
+	rate = espeak_Initialize(AUDIO_OUTPUT_PLAYBACK, 0, NULL, 0);
 	if (rate < 0) {
 		fprintf(stderr, "Unable to initialize espeak.\n");
 		return -1;
