[RFC REPOST 3/7] virCgroupSetFCAppid: properly handle when appid is NULL

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With introduction of live changes of appid we should also support
removal of the appid from VM. This is done by writing empty appid part
to appid_store file.

Signed-off-by: Pavel Hrdina <phrdina@xxxxxxxxxx>
---
 src/util/vircgroup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/util/vircgroup.c b/src/util/vircgroup.c
index ad0ee20862..9470ab061d 100644
--- a/src/util/vircgroup.c
+++ b/src/util/vircgroup.c
@@ -4026,7 +4026,7 @@ virCgroupSetFCAppid(virCgroup *group,
     if (inode < 0)
         return -1;
 
-    vmid = g_strdup_printf("%X:%s", inode, appid);
+    vmid = g_strdup_printf("%X:%s", inode, appid ? appid : "");
 
     if (virFileWriteStr(path, vmid, 0) < 0) {
         virReportSystemError(errno,
-- 
2.31.1




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