virt plugin: compare pointer to NULL, not 0

Found with coccinelle

diff --git a/src/virt.c b/src/virt.c
index bbf5afc..e5a8725 100644 (file)
--- a/src/virt.c
+++ b/src/virt.c
@@ -687,7 +687,7 @@ refresh_lists (void)
 
         /* Get list of domains. */
         domids = malloc (sizeof (*domids) * n);
-        if (domids == 0) {
+        if (domids == NULL) {
             ERROR (PLUGIN_NAME " plugin: malloc failed.");
             return -1;
         }