[Bug 48349] New: Steam doesn't display main window

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=48349

Bug ID: 48349
           Summary: Steam doesn't display main window
           Product: Wine
           Version: 5.0-rc2
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: winhttp
          Assignee: [e-mail]
          Reporter: [e-mail]
   Regression SHA1: 4ad4173e3a715d5bd27bedc164718cef9cafe0a4
      Distribution: ---

After 4ad4173e3a715d5bd27bedc164718cef9cafe0a4,
detect_autoproxyconfig_url_dns() could return an undefined value up to
WinHttpDetectAutoProxyConfigUrl(), which is causing Steam no longer start. The
undefined value is from the undefined ret variable and when
getaddrinfo("wpad.[domain]") failed.