[PATCH] lxc: don't update memUsage when failing to get memory usage

[Chen Hanxiao <chenhanxiao@xxxxxxxxxxxxxx>]

Signed-off-by: Chen Hanxiao <chenhanxiao@xxxxxxxxxxxxxx>
---
 src/lxc/lxc_cgroup.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/lxc/lxc_cgroup.c b/src/lxc/lxc_cgroup.c
index 8dfdc60..af95941 100644
--- a/src/lxc/lxc_cgroup.c
+++ b/src/lxc/lxc_cgroup.c
@@ -194,7 +194,8 @@ static int virLXCCgroupGetMemUsage(virCgroupPtr cgroup,
     unsigned long memUsage;
 
     ret = virCgroupGetMemoryUsage(cgroup, &memUsage);
-    meminfo->memusage = (unsigned long long) memUsage;
+    if (ret == 0)
+        meminfo->memusage = (unsigned long long) memUsage;
 
     return ret;
 }
-- 
1.9.0

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