coreaudio-encoder: Fix input buffer freeing in complex_input_data_proc

When the bitrate was set to 64 CoreAudio would call
complex_input_data_proc more than once, which in turn would cause
consumed bytes in the input buffer to be "freed" more than once (once
for every additional call of complex_input_data_proc and once in
aac_encode)

plugins/coreaudio-encoder/encoder.c

@@ -366,8 +366,10 @@ static OSStatus complex_input_data_proc(AudioConverterRef inAudioConverter,
 
 	ca_encoder *ca = inUserData;
 
-	if (ca->bytes_read)
+	if (ca->bytes_read) {
 		da_erase_range(ca->input_buffer, 0, ca->bytes_read);
+		ca->bytes_read = 0;
+	}
 
 	if (ca->input_buffer.num < ca->in_bytes_required) {
 		*ioNumberDataPackets = 0;