From b39a4d0b3941be82629d94dfd06f1ddc13fb260b Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Thu, 15 Sep 2011 18:23:58 +0200
Subject: [PATCH] fixed a problem in bioOlderJobType() when there are no jobs
 of the specified type. Now the function returns 0 when this happens.

---
 src/bio.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/bio.c b/src/bio.c
index 6f2c8a6c..fc4d5669 100644
--- a/src/bio.c
+++ b/src/bio.c
@@ -188,6 +188,10 @@ time_t bioOlderJobOfType(int type) {
 
     pthread_mutex_lock(&bio_mutex[type]);
     ln = listFirst(bio_jobs[type]);
+    if (ln == NULL) {
+        pthread_mutex_unlock(&bio_mutex[type]);
+        return 0;
+    }
     job = ln->value;
     time = job->time;
     pthread_mutex_unlock(&bio_mutex[type]);