Explain to FlexeLint that vsb_new()/vsb_delete() are alloc/free functions.

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@2612 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/flint.lnt

@@ -14,6 +14,8 @@
 // Fix strchr() semtics, it can only return NULL if arg2 != 0
 -sem(strchr, 1p, type(1), 2n == 0 ? (@p < 1p) : (@p < 1p || @p == 0 ))
 
+-sem(vsb_new, @p == malloc(1))
+-sem(vsb_delete, custodial(1))
 -sem(lbv_assert, r_no)
 -sem(lbv_xxxassert, r_no)
 -sem(WS_Init, custodial(2))