BUG/MEDIUM: compression: does not forward trailers

The commit bf3ae617 introduced a regression about the forward of the
trailers in compression mode.
diff --git a/src/compression.c b/src/compression.c
index 3622d40..fd5f790 100644
--- a/src/compression.c
+++ b/src/compression.c
@@ -298,10 +298,6 @@
 	/* forward the new chunk without remaining data */
 	b_adv(ob, to_forward);
 
-	/* if there are data between p and next, there are trailers, must forward them */
-	b_adv(ob, msg->next);
-	msg->next = 0;
-
 	return to_forward;
 }
 
diff --git a/src/proto_http.c b/src/proto_http.c
index b82d453..aea1ec2 100644
--- a/src/proto_http.c
+++ b/src/proto_http.c
@@ -5691,7 +5691,12 @@
 					http_capture_bad_message(&s->be->invalid_rep, s, msg, HTTP_MSG_TRAILERS, s->fe);
 				goto return_bad_res;
 			}
-					/* we're in HTTP_MSG_DONE now */
+			if (s->comp_algo != NULL) {
+				/* forwarding trailers */
+				channel_forward(res, msg->next);
+				msg->next = 0;
+			}
+			/* we're in HTTP_MSG_DONE now */
 		}
 		else {
 			int old_state = msg->msg_state;