Align ban lumps

should fix #2050

bin/varnishd/cache/cache_ban.c

@@ -183,7 +183,8 @@ ban_get_lump(const uint8_t **bs)
 	while (**bs == 0xff)
 		*bs += 1;
 	ln = vbe32dec(*bs);
-	*bs += 4;
+	*bs += PRNDUP(sizeof(uint32_t));
+	assert(PAOK(*bs));
 	r = (const void*)*bs;
 	*bs += ln;
 	return (r);

bin/varnishd/cache/cache_ban_build.c

@@ -101,7 +101,7 @@ BAN_Abandon(struct ban_proto *bp)
 static void
 ban_add_lump(const struct ban_proto *bp, const void *p, uint32_t len)
 {
-	uint8_t buf[sizeof len];
+	uint8_t buf[PRNDUP(sizeof len)];
 
 	buf[0] = 0xff;
 	while (VSB_len(bp->vsb) & PALGN)