MINOR: muxes: Improve show_fd callbacks to dump endpoint flags

H1, H2 and FCGI multiplexers define a show_fd callback to dump some internal
info. The stream endpoint and its flags are now dumped if it exists.
diff --git a/src/mux_fcgi.c b/src/mux_fcgi.c
index 33b69a2..56a9a0b 100644
--- a/src/mux_fcgi.c
+++ b/src/mux_fcgi.c
@@ -4189,9 +4189,12 @@
 			      (unsigned int)b_data(&fstrm->rxbuf), b_orig(&fstrm->rxbuf),
 			      (unsigned int)b_head_ofs(&fstrm->rxbuf), (unsigned int)b_size(&fstrm->rxbuf),
 			      fstrm->cs);
-		if (fstrm->cs)
-			chunk_appendf(msg, " .cs.flg=0x%08x .cs.app=%p",
-				      fstrm->cs->flags, fstrm->cs->app);
+		if (fstrm->endp) {
+			chunk_appendf(msg, " .endp.flg=0x%08x", fstrm->endp->flags);
+			if (!(fstrm->endp->flags & CS_EP_ORPHAN))
+				chunk_appendf(msg, " .cs.flg=0x%08x .cs.app=%p",
+					      fstrm->cs->flags, fstrm->cs->app);
+		}
 		chunk_appendf(&trash, " .subs=%p", fstrm->subs);
 		if (fstrm->subs) {
 			chunk_appendf(&trash, "(ev=%d tl=%p", fstrm->subs->events, fstrm->subs->tasklet);
diff --git a/src/mux_h1.c b/src/mux_h1.c
index 6bfb69b..851967e 100644
--- a/src/mux_h1.c
+++ b/src/mux_h1.c
@@ -3889,15 +3889,17 @@
 			method = http_known_methods[h1s->meth].ptr;
 		else
 			method = "UNKNOWN";
-		chunk_appendf(msg, " h1s=%p h1s.flg=0x%x .req.state=%s .res.state=%s"
+		chunk_appendf(msg, " h1s=%p h1s.flg=0x%x .endp.flg=0x%x .req.state=%s .res.state=%s"
 		    " .meth=%s status=%d",
-			      h1s, h1s->flags,
+			      h1s, h1s->flags, h1s->endp->flags,
 			      h1m_state_str(h1s->req.state),
 			      h1m_state_str(h1s->res.state), method, h1s->status);
-		if (h1s->cs)
-			chunk_appendf(msg, " .cs.flg=0x%08x .cs.app=%p",
-				      h1s->cs->flags, h1s->cs->app);
-
+		if (h1s->endp) {
+			chunk_appendf(msg, " .endp.flg=0x%08x", h1s->endp->flags);
+			if (!(h1s->endp->flags & CS_EP_ORPHAN))
+				chunk_appendf(msg, " .cs.flg=0x%08x .cs.app=%p",
+					      h1s->cs->flags, h1s->cs->app);
+		}
 		chunk_appendf(&trash, " .subs=%p", h1s->subs);
 		if (h1s->subs) {
 			chunk_appendf(&trash, "(ev=%d tl=%p", h1s->subs->events, h1s->subs->tasklet);
diff --git a/src/mux_h2.c b/src/mux_h2.c
index 71327b8..3b321d5 100644
--- a/src/mux_h2.c
+++ b/src/mux_h2.c
@@ -6744,6 +6744,11 @@
 			chunk_appendf(msg, "(.flg=0x%08x .app=%p)",
 				      h2s->cs->flags, h2s->cs->app);
 
+		chunk_appendf(msg, "endp=%p", h2s->endp);
+		if (h2s->endp)
+			chunk_appendf(msg, "(.flg=0x%08x)",
+				      h2s->endp->flags);
+
 		chunk_appendf(&trash, " .subs=%p", h2s->subs);
 		if (h2s->subs) {
 			chunk_appendf(&trash, "(ev=%d tl=%p", h2s->subs->events, h2s->subs->tasklet);