Export the flush_queue function for use by drivers.

miner.h

@@ -1396,6 +1396,7 @@ extern void __work_completed(struct cgpu_info *cgpu, struct work *work);
 extern int age_queued_work(struct cgpu_info *cgpu, double secs);
 extern void work_completed(struct cgpu_info *cgpu, struct work *work);
 extern struct work *take_queued_work_bymidstate(struct cgpu_info *cgpu, char *midstate, size_t midstatelen, char *data, int offset, size_t datalen);
+extern void flush_queue(struct cgpu_info *cgpu);
 extern void hash_driver_work(struct thr_info *mythr);
 extern void hash_queued_work(struct thr_info *mythr);
 extern void _wlog(const char *str);

sgminer.c

@@ -3767,8 +3767,6 @@ int restart_wait(struct thr_info *thr, unsigned int mstime)
 	return rc;
 }
 
-static void flush_queue(struct cgpu_info *cgpu);
-
 static void *restart_thread(void __maybe_unused *arg)
 {
 	struct pool *cp = current_pool();
@@ -6459,7 +6457,7 @@ struct work *take_queued_work_bymidstate(struct cgpu_info *cgpu, char *midstate,
 	return work;
 }
 
-static void flush_queue(struct cgpu_info *cgpu)
+void flush_queue(struct cgpu_info *cgpu)
 {
 	struct work *work = NULL;