Fix PlaybackChannel forward declaration

This caused a jenkins build failure:

snd_worker.c:148: error: redefinition of typedef 'PlaybackChannel'
snd_worker.c:126: note: previous declaration of 'PlaybackChannel' was here

1 files changed, 2 insertions, 3 deletions

diff --git a/server/snd_worker.c b/server/snd_worker.c
index 6034aec0..a12397eb 100644
--- a/server/snd_worker.c
+++ b/server/snd_worker.c
@@ -122,7 +122,6 @@ struct SndChannel {
     snd_channel_cleanup_channel_proc cleanup;
 };
 
-struct PlaybackChannel;
 typedef struct PlaybackChannel PlaybackChannel;
 
 typedef struct AudioFrame AudioFrame;
@@ -133,7 +132,7 @@ struct AudioFrame {
     AudioFrame *next;
 };
 
-typedef struct PlaybackChannel {
+struct PlaybackChannel {
     SndChannel base;
     AudioFrame frames[3];
     AudioFrame *free_frames;
@@ -145,7 +144,7 @@ typedef struct PlaybackChannel {
     struct {
         uint8_t celt_buf[CELT_COMPRESSED_FRAME_BYTES];
     } send_data;
-} PlaybackChannel;
+};
 
 struct SndWorker {
     RedChannel *base_channel;