src: fix formatting of PIDs

PR-URL: #21852
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Jon Moss <me@jonathanmoss.me>

src/env.cc

@@ -315,7 +315,7 @@ void Environment::PrintSyncTrace() const {
   Local<v8::StackTrace> stack =
       StackTrace::CurrentStackTrace(isolate(), 10, StackTrace::kDetailed);
 
-  fprintf(stderr, "(node:%u) WARNING: Detected use of sync API\n",
+  fprintf(stderr, "(node:%d) WARNING: Detected use of sync API\n",
           uv_os_getpid());
 
   for (int i = 0; i < stack->GetFrameCount() - 1; i++) {

src/util.cc

@@ -115,7 +115,7 @@ std::string GetHumanReadableProcessName() {
 void GetHumanReadableProcessName(char (*name)[1024]) {
   char title[1024] = "Node.js";
   uv_get_process_title(title, sizeof(title));
-  snprintf(*name, sizeof(*name), "%s[%u]", title, uv_os_getpid());
+  snprintf(*name, sizeof(*name), "%s[%d]", title, uv_os_getpid());
 }
 
 }  // namespace node