egl/drm: Don't "fall back" to /dev/dri/card0 if the first open fails

The snprintf stuff here already constructs the right name for the device
node, and if it doesn't, you configured Mesa wrong, don't do that.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>

src/egl/drivers/dri2/platform_drm.c

@@ -667,8 +667,6 @@ dri2_initialize_drm(_EGLDriver *drv, _EGLDisplay *disp)
       int n = snprintf(buf, sizeof(buf), DRM_DEV_NAME, DRM_DIR_NAME, 0);
       if (n != -1 && n < sizeof(buf))
          dri2_dpy->fd = loader_open_device(buf);
-      if (dri2_dpy->fd < 0)
-         dri2_dpy->fd = loader_open_device("/dev/dri/card0");
       gbm = gbm_create_device(dri2_dpy->fd);
       if (gbm == NULL) {
          err = "DRI2: failed to create gbm device";