Revert "xf86drm: ignore symlinks in process_device()"

This reverts commit 7ab1cdac90.

This breaks numerous tools that rely on being able to read symlinks, and
constitutes a regression.

Signed-off-by: Dylan Baker <dylan.c.baker@intel.com>
Tested-by: Mark Janes <markjanes@swizzler.org>
Tested-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Closes: #103

xf86drm.c

@@ -4479,10 +4479,7 @@ process_device(drmDevicePtr *device, const char *d_name,
         return -1;
 
     snprintf(node, PATH_MAX, "%s/%s", DRM_DIR_NAME, d_name);
-    if (lstat(node, &sbuf))
-        return -1;
-
-    if (S_ISLNK(sbuf.st_mode))
+    if (stat(node, &sbuf))
         return -1;
 
     maj = major(sbuf.st_rdev);