[libvirt] [PATCH 1/4] util: Check for empty allocation instead of just NULL pointer

[Martin Kletzander]

When working on the CAT series one of the changes was that the pointer got
allocated in another part of the code, even when resctrl was not available on
the host system.  However this one particular place neglected that so it needs
to be fixed in order to get the proper error message when requesting
<cachetune/> on HW with no support for it.

Signed-off-by: Martin Kletzander <mkletzan at redhat.com>
---
 src/util/virresctrl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/util/virresctrl.c b/src/util/virresctrl.c
index 754820ee463e..03218a481dc0 100644
--- a/src/util/virresctrl.c
+++ b/src/util/virresctrl.c
@@ -1472,7 +1472,7 @@ virResctrlAllocCreate(virResctrlInfoPtr resctrl,
     if (!alloc)
         return 0;
 
-    if (!resctrl) {
+    if (virResctrlInfoIsEmpty(resctrl)) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
                        _("Resource control is not supported on this host"));
         return -1;
-- 
2.16.1