logd: whitelist should not preserve expire messages

Change-Id: I56275c73191b96aa21e7b4049d401e1f44211f9b
diff --git a/logd/LogBuffer.cpp b/logd/LogBuffer.cpp
index 8c0a0be..24499ae 100644
--- a/logd/LogBuffer.cpp
+++ b/logd/LogBuffer.cpp
@@ -526,7 +526,7 @@
             break;
         }
 
-        if (hasWhitelist && mPrune.nice(e)) { // WhiteListed
+        if (hasWhitelist && !e->getDropped() && mPrune.nice(e)) { // WhiteListed
             whitelist = true;
             it++;
             continue;