[master] e95fda1db Fix compilation on certain llvm versions

[Poul-Henning Kamp]

commit e95fda1dbabdcb46547c733e5c744b4e7422a56e
Author: Poul-Henning Kamp <phk at FreeBSD.org>
Date:   Mon Dec 30 12:51:42 2019 +0000

    Fix compilation on certain llvm versions

diff --git a/lib/libvarnish/vtcp.c b/lib/libvarnish/vtcp.c
index 1d7ca9a18..a7ed8f4f9 100644
--- a/lib/libvarnish/vtcp.c
+++ b/lib/libvarnish/vtcp.c
@@ -152,7 +152,7 @@ VTCP_filter_http(int sock)
 	struct accept_filter_arg afa;
 
 	memset(&afa, 0, sizeof afa);
-	bprintf(afa.af_name, "httpready");
+	bprintf(afa.af_name, "%s", "httpready");
 	errno = 0;
 	retval = setsockopt(sock, SOL_SOCKET, SO_ACCEPTFILTER,
 	    &afa, sizeof afa);