EGL: Handle null resultOut for sync tail call destruction Syncs can be destroyed during eglDestroySync or as part of display destruction. During display distruction there is no result so swallow any errors. Bug: angleproject:8434 Change-Id: I172d268c91fd0d6ba534eceff8914f9c719bdf39 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5533777 Commit-Queue: Geoff Lang <geofflang@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>