[master] fa98d41e3 Replace magic number with VSL_IDSHIFT

[Nils Goroll]

commit fa98d41e3a0f491512d7add166877880dcc8187f
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Tue Jun 13 18:39:55 2023 +0200

    Replace magic number with VSL_IDSHIFT

diff --git a/bin/varnishd/cache/cache_shmlog.c b/bin/varnishd/cache/cache_shmlog.c
index 9c1fefe33..8a040ee70 100644
--- a/bin/varnishd/cache/cache_shmlog.c
+++ b/bin/varnishd/cache/cache_shmlog.c
@@ -355,7 +355,7 @@ VSL_Flush(struct vsl_log *vsl, int overflow)
 	memcpy(p + VSL_OVERHEAD, vsl->wlb, l);
 	p[1] = l;
 	VWMB();
-	p[0] = ((((unsigned)SLT__Batch & 0xff) << 24));
+	p[0] = ((((unsigned)SLT__Batch & 0xff) << VSL_IDSHIFT));
 	vsl->wlp = vsl->wlb;
 	vsl->wlr = 0;
 }