fieldanalysis: Fix unitiailized variable compiler warning

And also use the pad's default event function instead
of just pushing to the peerpad. This makes sure any
default handling of events is called.

gst/fieldanalysis/gstfieldanalysis.c

@@ -792,11 +792,12 @@ gst_field_analysis_sink_event (GstPad * pad, GstObject * parent,
       break;
     }
     default:
+      forward = TRUE;
       break;
   }
 
   if (forward) {
-    ret = gst_pad_push_event (filter->srcpad, event);
+    ret = gst_pad_event_default (pad, parent, event);
   }
 
   return ret;