BUG/MINOR: mux-h1: Be sure to update the count before adding EOM after trailers

Otherwise, an EOM may be added in a full buffer.

This patch must be backported to 2.0.
diff --git a/src/mux_h1.c b/src/mux_h1.c
index 90fb9e6..647a44f 100644
--- a/src/mux_h1.c
+++ b/src/mux_h1.c
@@ -1476,7 +1476,7 @@
 				if (!ret)
 					break;
 			}
-			if (!h1_process_eom(h1s, h1m, htx, count))
+			else if (!h1_process_eom(h1s, h1m, htx, count))
 				break;
 		}
 		else if (h1m->state == H1_MSG_DONE) {