logd: rename FlushToResult to FilterResult

This was a typo; the enum corresponds to the result of the 'Filter'
function, not the 'FlushTo' function.

Test: build
Change-Id: Ib46f0646570b6dbaac17ae9fc95c990128cdbe72
diff --git a/logd/SimpleLogBuffer.cpp b/logd/SimpleLogBuffer.cpp
index 1c83428..d60805d 100644
--- a/logd/SimpleLogBuffer.cpp
+++ b/logd/SimpleLogBuffer.cpp
@@ -112,7 +112,7 @@
 
 uint64_t SimpleLogBuffer::FlushTo(
         LogWriter* writer, uint64_t start, pid_t* last_tid,
-        const std::function<FlushToResult(const LogBufferElement* element)>& filter) {
+        const std::function<FilterResult(const LogBufferElement* element)>& filter) {
     auto shared_lock = SharedLock{lock_};
 
     std::list<LogBufferElement>::iterator it;
@@ -146,11 +146,11 @@
         }
 
         if (filter) {
-            FlushToResult ret = filter(&element);
-            if (ret == FlushToResult::kSkip) {
+            FilterResult ret = filter(&element);
+            if (ret == FilterResult::kSkip) {
                 continue;
             }
-            if (ret == FlushToResult::kStop) {
+            if (ret == FilterResult::kStop) {
                 break;
             }
         }