Remove unused function log_queue

SocketRocket/SRWebSocket.m

@@ -88,7 +88,6 @@ typedef struct {
 static NSString *const SRWebSocketAppendToSecKeyString = @"258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
 
 static inline int32_t validate_dispatch_data_partial_string(NSData *data);
-static inline dispatch_queue_t log_queue();
 static inline void SRFastLog(NSString *format, ...);
 
 @interface NSData (SRWebSocket)
@@ -1603,16 +1602,6 @@ static const size_t SRFrameHeaderOverhead = 32;
 
 @end
 
-static inline dispatch_queue_t log_queue() {
-    static dispatch_queue_t queue = 0;
-    static dispatch_once_t onceToken;
-    dispatch_once(&onceToken, ^{
-        queue = dispatch_queue_create("fast log queue", DISPATCH_QUEUE_SERIAL);
-    });
-    
-    return queue;
-}
-
 //#define SR_ENABLE_LOG
 
 static inline void SRFastLog(NSString *format, ...)  {