Better comment

llvm-svn: 147532
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: f368486f4c09e7de29f094c793a666b35f806790
diff --git a/src/cxa_exception.cpp b/src/cxa_exception.cpp
index a011dd0..53623cf 100644
--- a/src/cxa_exception.cpp
+++ b/src/cxa_exception.cpp
@@ -388,7 +388,7 @@
 //  get the current exception
     __cxa_eh_globals* globals = __cxa_get_globals_fast();
     if (NULL == globals)
-        return NULL;        //  Never has been an exception
+        return NULL;        //  If there are no globals, there is no exception
     __cxa_exception* current_exception = globals->caughtExceptions;
     if (NULL == current_exception)
         return NULL;        //  No current exception