BUG/MEDIUM: h1: Correctly report used data with no len.

When we have no content-length, and not in chunk mode, correctly
report the used data. We really used "ret", and not "max".
diff --git a/src/mux_h1.c b/src/mux_h1.c
index cb4341f..b0d5567 100644
--- a/src/mux_h1.c
+++ b/src/mux_h1.c
@@ -1103,8 +1103,8 @@
 			if (!htx_add_data(htx, ist2(b_peek(buf, *ofs), ret)))
 				goto end;
 
-			*ofs += max;
-			total = max;
+			*ofs += ret;
+			total = ret;
 		}
 	}