don't crash when called without arguments

ChangeLog

+Thu May  7 09:16:05 CEST 2009 Guido Günther <agx@sigxcpu.org>
+
+	* src/lxc_controller.c (main): don't crash when called without
+	arguments
+
 Wed May  6 16:55:02 GMT 2009 Mark McLoughlin <markmc@redhat.com>
 
 	* src/qemu_driver.c: fix handling of <hostdev managed='yes'>

src/lxc_controller.c

@@ -745,6 +745,7 @@ int main(int argc, char *argv[])
 
 
 cleanup:
+    if (def)
         virFileDeletePid(LXC_STATE_DIR, def->name);
     lxcControllerCleanupInterfaces(nveths, veths);
     unlink(sockpath);