Preincrement seq#, otherwise it makes no difference.

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@4960 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/vsm.c

@@ -116,7 +116,7 @@ VSM_Alloc(unsigned size, const char *class, const char *type, const char *ident)
 		VWMB();
 		if (seq != 0)
 			do
-				loghead->alloc_seq = seq++;
+				loghead->alloc_seq = ++seq;
 			while (loghead->alloc_seq == 0);
 
 		return (VSM_PTR(sha));