logd: trailing spaces in log statistics

Bug: 30118730
Change-Id: I8cccbc1da2cf8168ec9cf12f07df4cafef076558
diff --git a/logd/LogStatistics.cpp b/logd/LogStatistics.cpp
index 02a4a75..a2d2aa5 100644
--- a/logd/LogStatistics.cpp
+++ b/logd/LogStatistics.cpp
@@ -284,7 +284,7 @@
             if ((spaces <= 0) && pruned.length()) {
                 spaces = 1;
             }
-            if (spaces > 0) {
+            if ((spaces > 0) && (pruned.length() != 0)) {
                 change += android::base::StringPrintf("%*s", (int)spaces, "");
             }
             pruned = change + pruned;