From 9d0c2462943a3a5e69c1a69a4385bc7204eb5674 Mon Sep 17 00:00:00 2001
From: ncteisen <ncteisen@gmail.com>
Date: Mon, 9 Apr 2018 12:20:30 -0700
Subject: [PATCH] Add clarifying comment, stylistic consistency

---
 src/core/lib/debug/trace.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/core/lib/debug/trace.cc b/src/core/lib/debug/trace.cc
index e6660c6c817..01c1e867d9d 100644
--- a/src/core/lib/debug/trace.cc
+++ b/src/core/lib/debug/trace.cc
@@ -55,7 +55,8 @@ bool TraceFlagList::Set(const char* name, bool enabled) {
         found = true;
       }
     }
-    if (!found && strcmp(name, "")) {
+    // check for unknowns, but ignore "", to allow to GRPC_TRACE=
+    if (!found && 0 != strcmp(name, "")) {
       gpr_log(GPR_ERROR, "Unknown trace var: '%s'", name);
       return false; /* early return */
     }