8348323: Corrupted timezone string in JVM crash log

Reviewed-by: dholmes, amitkumar, kevinw

Author: Dhamoder Nalla

src/hotspot/share/runtime/os.cpp

@@ -1212,8 +1212,7 @@ void os::print_date_and_time(outputStream *st, char* buf, size_t buflen) {
   if (localtime_pd(&tloc, &tz) != nullptr) {
     wchar_t w_buf[80];
     size_t n = ::wcsftime(w_buf, 80, L"%Z", &tz);
-    if (n > 0) {
-      ::wcstombs(buf, w_buf, buflen);
+    if (n > 0 && ::wcstombs(buf, w_buf, buflen) != (size_t)-1) {
       st->print("Time: %s %s", timestring, buf);
     } else {
       st->print("Time: %s", timestring);