Never wait indefinitely for a pthread conditional in the hash_pop loop in case the work scheduler misses the last wakeup.

cgminer.c

@@ -5915,7 +5915,6 @@ static struct work *hash_pop(void)
 
 	mutex_lock(stgd_lock);
 	while (!HASH_COUNT(staged_work)) {
-		if (!no_work) {
 		struct timespec then;
 		struct timeval now;
 		int rc;
@@ -5932,10 +5931,6 @@ static struct work *hash_pop(void)
 			no_work = true;
 			applog(LOG_WARNING, "Waiting for work to be available from pools.");
 		}
-		} else {
-			pthread_cond_signal(&gws_cond);
-			pthread_cond_wait(&getq->cond, stgd_lock);
-		}
 	}
 
 	if (no_work) {