vz_utils: Reformat

Honour our formatting style. Adjust indentation so it matches the
rest of our code.
Signed-off-by: NMichal Privoznik <mprivozn@redhat.com>

src/vz/vz_utils.h

@@ -77,8 +77,8 @@ typedef struct _vzConn *vzConnPtr;
 struct _vzCountersCache {
     PRL_HANDLE stats;
     virCond cond;
-    // -1 - unsubscribed
-    // > -1 - subscribed
+    /* = -1 - unsubscribed
+       > -1 - subscribed */
     int count;
 };