Wayland: Fix glfwInit closing stdin on failure

If platform initialization failed before either timer fd member had been
set to -1 or a valid fd, termination would close stdin.

README.md

@@ -342,6 +342,7 @@ information on what to include when reporting a bug.
  - [Wayland] Bugfix: `glfwSetWindowSize` would resize a full screen window
  - [Wayland] Bugfix: A window content scale event would be emitted every time
    the window resized
+ - [Wayland] Bugfix: If `glfwInit` failed it would close stdin
  - [POSIX] Removed use of deprecated function `gettimeofday`
  - [POSIX] Bugfix: `CLOCK_MONOTONIC` was not correctly tested for or enabled
  - [WGL] Disabled the DWM swap interval hack for Windows 8 and later (#1072)

src/wl_init.c

@@ -479,6 +479,10 @@ int _glfwInitWayland(void)
     long cursorSizeLong;
     int cursorSize;
 
+    // These must be set before any failure checks
+    _glfw.wl.timerfd = -1;
+    _glfw.wl.cursorTimerfd = -1;
+
     _glfw.wl.client.display_flush = (PFN_wl_display_flush)
         _glfwPlatformGetModuleSymbol(_glfw.wl.client.handle, "wl_display_flush");
     _glfw.wl.client.display_cancel_read = (PFN_wl_display_cancel_read)
@@ -635,7 +639,6 @@ int _glfwInitWayland(void)
     // Sync so we got all initial output events
     wl_display_roundtrip(_glfw.wl.display);
 
-    _glfw.wl.timerfd = -1;
     if (_glfw.wl.seatVersion >= 4)
         _glfw.wl.timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC | TFD_NONBLOCK);