pitch: fix latency reporting

When max is GST_CLOCK_TIME_NONE in the query, it should not
be set in the query handler, this otherwise could lead to
impossible situations, where the minimum latency ended up
greater than the maximum.

https://bugzilla.gnome.org/show_bug.cgi?id=796603
diff --git a/ext/soundtouch/gstpitch.cc b/ext/soundtouch/gstpitch.cc
index e70e298..41b6621 100644
--- a/ext/soundtouch/gstpitch.cc
+++ b/ext/soundtouch/gstpitch.cc
@@ -645,8 +645,6 @@
           min += pitch->min_latency;
           if (max != GST_CLOCK_TIME_NONE)
             max += pitch->max_latency;
-          else
-            max = pitch->max_latency;
 
           GST_DEBUG ("Calculated total latency : min %"
               GST_TIME_FORMAT " max %" GST_TIME_FORMAT,