win: Fix pipe leak on connection

util/win/exception_handler_server.cc

Index: util/win/exception_handler_server.cc
diff --git a/util/win/exception_handler_server.cc b/util/win/exception_handler_server.cc
index 2d702f20d0627a18a54597197b77c3920b015279..50a5fa3c509021cb4fe28eb6bf875e34bd243e83 100644
--- a/util/win/exception_handler_server.cc
+++ b/util/win/exception_handler_server.cc
@@ -211,6 +211,7 @@ void ExceptionHandlerServer::Run(Delegate* delegate,
                         512,
                         0,
                         nullptr);
+    PCHECK(pipe != INVALID_HANDLE_VALUE) << "CreateNamedPipe";
 
     // Ownership of this object (and the pipe instance) is given to the new
     // thread. We close the thread handles at the end of the scope. They clean
@@ -224,6 +225,7 @@ void ExceptionHandlerServer::Run(Delegate* delegate,
                                          shutdown_token);
     thread_handles[i].reset(
         CreateThread(nullptr, 0, &PipeServiceProc, context, 0, nullptr));
+    PCHECK(thread_handles[i].is_valid()) << "CreateThread";
   }
 
   delegate->ExceptionHandlerServerStarted();