[PATCH] util: don't attempt to acquire logind inhibitor if not requested

[Daniel P. Berrangé <berrange@xxxxxxxxxx>]

When VIR_INHIBITOR_WHAT_NONE is passed to virInhibitorNew, it is
an indication that daemon shutdown should be inhibited, but no
OS level inhibitors acquired. This is done by the virtnetworkd
daemon, for example, to prevent shutdown while running virtual
machines are present, without blocking / delaying OS shutdown.

Unfortunately the code forgot to skip the DBus call in this case,
resulting in errors being logged.

Signed-off-by: Daniel P. Berrangé <berrange@xxxxxxxxxx>
---
 src/util/virinhibitor.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/util/virinhibitor.c b/src/util/virinhibitor.c
index 647bdc9fbb..a95021de5a 100644
--- a/src/util/virinhibitor.c
+++ b/src/util/virinhibitor.c
@@ -152,7 +152,7 @@ virInhibitor *virInhibitorNew(virInhibitorWhat what,
     virInhibitor *inhibitor = g_new0(virInhibitor, 1);
 
     inhibitor->fd = -1;
-    inhibitor->what = virInhibitorWhatFormat(what);
+    inhibitor->what = what ? virInhibitorWhatFormat(what) : NULL;
     inhibitor->who = g_strdup(who);
     inhibitor->why = g_strdup(why);
     inhibitor->mode = virInhibitorModeTypeToString(mode);
@@ -171,7 +171,8 @@ void virInhibitorHold(virInhibitor *inhibitor)
             inhibitor->action(true, inhibitor->actionData);
         }
 #ifdef G_OS_UNIX
-        if (virInhibitorAcquire(
+        if (inhibitor->what &&
+            virInhibitorAcquire(
                 inhibitor->what, inhibitor->who, inhibitor->why,
                 inhibitor->mode, &inhibitor->fd) < 0) {
             VIR_ERROR(_("Failed to acquire inhibitor: %1$s"),
-- 
2.47.1