Fix OSS compilation due to redefined audio variable.

diff --git a/src/lingot-audio-oss.c b/src/lingot-audio-oss.c
index 1e1b998..5612521 100644
--- a/src/lingot-audio-oss.c
+++ b/src/lingot-audio-oss.c
@@ -48,7 +48,7 @@ LingotAudioHandler* lingot_audio_oss_new(char* device, int sample_rate) {
 	char error_message[100];
 	const char* exception;

-	LingotAudioHandler* audio = malloc(sizeof(LingotAudioHandler));
+	audio = malloc(sizeof(LingotAudioHandler));

 	audio->audio_system = AUDIO_SYSTEM_OSS;
 	audio->dsp = open(device, O_RDONLY);