Coverity: Resolve a RESOURCE_LEAK

On error the lofd would have been leaked.

src/lxc/lxc_controller.c

@@ -383,6 +383,7 @@ static int virLXCControllerSetupLoopDeviceDisk(virDomainDiskDefPtr disk)
     int lofd;
     char *loname = NULL;
     const char *src = virDomainDiskGetSource(disk);
+    int ret = -1;
 
     if ((lofd = virFileLoopDeviceAssociate(src, &loname)) < 0)
         return -1;
@@ -395,13 +396,18 @@ static int virLXCControllerSetupLoopDeviceDisk(virDomainDiskDefPtr disk)
      * the rest of container setup 'just works'
      */
     virDomainDiskSetType(disk, VIR_DOMAIN_DISK_TYPE_BLOCK);
-    if (virDomainDiskSetSource(disk, loname) < 0) {
-        VIR_FREE(loname);
-        return -1;
-    }
+    if (virDomainDiskSetSource(disk, loname) < 0)
+        goto cleanup;
+
+    ret = 0;
+
+ cleanup:
     VIR_FREE(loname);
+    if (ret < 0)
+         VIR_FORCE_CLOSE(lofd);
 
     return lofd;
+
 }