Fix migrate use after free (#6578)
Fix migrate use after free (#6578)

Co-authored-by: Susan Hinrichs <1a32c1ae5617e82b439b596eb593321571c039a7@verizonmedia.com>
pbchou/trafficserver,pbchou/trafficserver,SolidWallOfCode/trafficserver,bryancall/trafficserver,SolidWallOfCode/trafficserver,duke8253/trafficserver,SolidWallOfCode/trafficserver,pbchou/trafficserver,bryancall/trafficserver,vmamidi/trafficserver,duke8253/trafficserver,duke8253/trafficserver,bryancall/trafficserver,duke8253/trafficserver,vmamidi/trafficserver,vmamidi/trafficserver,SolidWallOfCode/trafficserver,vmamidi/trafficserver,bryancall/trafficserver,pbchou/trafficserver,duke8253/trafficserver,duke8253/trafficserver,vmamidi/trafficserver,bryancall/trafficserver,SolidWallOfCode/trafficserver,vmamidi/trafficserver,bryancall/trafficserver,duke8253/trafficserver,SolidWallOfCode/trafficserver,pbchou/trafficserver,pbchou/trafficserver,SolidWallOfCode/trafficserver