[Tracing] Minor bugs fix.

src/libplatform/tracing/trace-object.cc

Index: src/libplatform/tracing/trace-object.cc
diff --git a/src/libplatform/tracing/trace-object.cc b/src/libplatform/tracing/trace-object.cc
index f8ad9f9f7d49a5ea0851513dad0d2453ccc6fba0..e16d174d35752023d0a0138d9a3c32e0aa98200f 100644
--- a/src/libplatform/tracing/trace-object.cc
+++ b/src/libplatform/tracing/trace-object.cc
@@ -24,9 +24,10 @@ V8_INLINE static void CopyTraceObjectParameter(char** buffer,
                                                const char** member,
                                                const char* end) {

[Yang, 2016/08/10 19:56:57]

is the last parameter still necessary?

   if (*member) {
-    strncpy(*buffer, *member, end - *buffer);
+    size_t length = strlen(*member) + 1;
+    strncpy(*buffer, *member, length);
     *member = *buffer;
-    *buffer += strlen(*member) + 1;
+    *buffer += length;
   }
 }