Fixes memory leaks in compress plugin
Fixes memory leaks in compress plugin

Prior to this, the plugin would leak every reload

SolidWallOfCode/trafficserver,dyrock/trafficserver,bryancall/trafficserver,vmamidi/trafficserver,chitianhao/trafficserver,vmamidi/trafficserver,dyrock/trafficserver,davidbz/trafficserver,dyrock/trafficserver,chitianhao/trafficserver,davidbz/trafficserver,duke8253/trafficserver,pbchou/trafficserver,dyrock/trafficserver,duke8253/trafficserver,vmamidi/trafficserver,bryancall/trafficserver,SolidWallOfCode/trafficserver,SolidWallOfCode/trafficserver,chitianhao/trafficserver,davidbz/trafficserver,pbchou/trafficserver,vmamidi/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,chitianhao/trafficserver,bryancall/trafficserver,dyrock/trafficserver,davidbz/trafficserver,davidbz/trafficserver,chitianhao/trafficserver,SolidWallOfCode/trafficserver,chitianhao/trafficserver,duke8253/trafficserver,pbchou/trafficserver,chitianhao/trafficserver,bryancall/trafficserver,dyrock/trafficserver,pbchou/trafficserver,bryancall/trafficserver,pbchou/trafficserver,bryancall/trafficserver,duke8253/trafficserver,duke8253/trafficserver,dyrock/trafficserver,davidbz/trafficserver,duke8253/trafficserver,pbchou/trafficserver,SolidWallOfCode/trafficserver,SolidWallOfCode/trafficserver,vmamidi/trafficserver,vmamidi/trafficserver