[master] a8b453c Allow EPIPE in VTCP_Check()

[Nils Goroll]

commit a8b453cb432e9717e1a8afab91433aa4294ba27e
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Tue Mar 21 13:41:25 2017 +0100

    Allow EPIPE in VTCP_Check()
    
    We may see it after a write on a socket which has been closed by
    the remote end.
    
    Fixes #2267

diff --git a/lib/libvarnish/vtcp.c b/lib/libvarnish/vtcp.c
index 67be8a0..9122f3e 100644
--- a/lib/libvarnish/vtcp.c
+++ b/lib/libvarnish/vtcp.c
@@ -577,7 +577,7 @@ VTCP_Check(int a)
 	 * connection.
 	 * This is a bug in Solaris and documented behaviour on NetBSD.
 	 */
-	if (errno == EINVAL || errno == ETIMEDOUT)
+	if (errno == EINVAL || errno == ETIMEDOUT || errno == EPIPE)
 		return (1);
 #endif
 	return (0);