Fix "G" logo changing position during device reboot.

Bug: 376214650
Flag: EXEMPT Fix typo
Test: Manual (before: https://paste.googleplex.com/6201863358906368 after: https://paste.googleplex.com/6215099508588544)
Change-Id: Id95f50a5c12c2ed77746c4b363464d79aacb8b6d
diff --git a/cmds/bootanimation/BootAnimation.cpp b/cmds/bootanimation/BootAnimation.cpp
index 14e2387..b43905b 100644
--- a/cmds/bootanimation/BootAnimation.cpp
+++ b/cmds/bootanimation/BootAnimation.cpp
@@ -451,7 +451,7 @@
                     auto token = SurfaceComposerClient::getPhysicalDisplayToken(
                         event.header.displayId);
 
-                    auto firstDisplay = mBootAnimation->mDisplays.front();
+                    auto& firstDisplay = mBootAnimation->mDisplays.front();
                     if (token != firstDisplay.displayToken) {
                         // ignore hotplug of a secondary display
                         continue;