Fix missing return in Enqueuer

Change-Id: I5af779609de512a5f3380d52b941660a48c6f32d

src/main/java/com/android/tools/r8/shaking/Enqueuer.java

diff --git a/src/main/java/com/android/tools/r8/shaking/Enqueuer.java b/src/main/java/com/android/tools/r8/shaking/Enqueuer.java
index 6dcfe4f..fdc7fb5 100644
--- a/src/main/java/com/android/tools/r8/shaking/Enqueuer.java
+++ b/src/main/java/com/android/tools/r8/shaking/Enqueuer.java
@@ -1120,9 +1120,9 @@
   public boolean registerFieldAccess(
       DexField field, ProgramMethod context, FieldAccessKind accessKind) {
     if (accessKind.isRead()) {
-      registerFieldRead(field, context);
+      return registerFieldRead(field, context);
     } else {
-      registerFieldWrite(field, context);
+      return registerFieldWrite(field, context);
     }
   }