logd: used before set warning

Change-Id: I30c078f8b22ebe4dcb48d57adf88b3e51b4fa202
diff --git a/logd/LogBuffer.cpp b/logd/LogBuffer.cpp
index ae167aa..0448afa 100644
--- a/logd/LogBuffer.cpp
+++ b/logd/LogBuffer.cpp
@@ -174,7 +174,7 @@
     if (last == mLogElements.end()) {
         mLogElements.push_back(elem);
     } else {
-        log_time end;
+        log_time end = log_time::EPOCH;
         bool end_set = false;
         bool end_always = false;