access: Change return type of virAccessDriverStackAppend to void

This function return value is invariant since VIR_EXPAND_N check
removal in 7d2fd6e, so change its type and remove all dependent checks.

Found by Linux Verification Center (linuxtesting.org) with Svace.

Reported-by: Pavel Nekrasov <p.nekrasov@fobos-nt.ru>
Signed-off-by: Alexander Kuznetsov <kuznetsovam@altlinux.org>
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>

src/access/viraccessdriverstack.c

@@ -32,16 +32,14 @@ struct _virAccessDriverStackPrivate {
 };
 
 
-int virAccessDriverStackAppend(virAccessManager *manager,
-                               virAccessManager *child)
+void virAccessDriverStackAppend(virAccessManager *manager,
+                                virAccessManager *child)
 {
     virAccessDriverStackPrivate *priv = virAccessManagerGetPrivateData(manager);
 
     VIR_EXPAND_N(priv->managers, priv->managersLen, 1);
 
     priv->managers[priv->managersLen-1] = child;
-
-    return 0;
 }
 
 

src/access/viraccessdriverstack.h

@@ -23,7 +23,7 @@
 #include "access/viraccessdriver.h"
 
 
-int virAccessDriverStackAppend(virAccessManager *manager,
-                               virAccessManager *child);
+void virAccessDriverStackAppend(virAccessManager *manager,
+                                virAccessManager *child);
 
 extern virAccessDriver accessDriverStack;

src/access/viraccessmanager.c

@@ -164,10 +164,7 @@ virAccessManager *virAccessManagerNewStack(const char **names)
         if (!child)
             goto error;
 
-        if (virAccessDriverStackAppend(manager, child) < 0) {
-            virObjectUnref(child);
-            goto error;
-        }
+        virAccessDriverStackAppend(manager, child);
     }
 
     return manager;