drm/vc4: no need to check return value of debugfs_create functions

When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

Reviewed-by: Eric Anholt <eric@anholt.net>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20190613114548.GC13119@kroah.com

drivers/gpu/drm/vc4/vc4_debugfs.c

@@ -29,13 +29,9 @@ vc4_debugfs_init(struct drm_minor *minor)
 {
 	struct vc4_dev *vc4 = to_vc4_dev(minor->dev);
 	struct vc4_debugfs_info_entry *entry;
-	struct dentry *dentry;
 
-	dentry = debugfs_create_bool("hvs_load_tracker", S_IRUGO | S_IWUSR,
-				     minor->debugfs_root,
-				     &vc4->load_tracker_enabled);
-	if (!dentry)
-		return -ENOMEM;
+	debugfs_create_bool("hvs_load_tracker", S_IRUGO | S_IWUSR,
+			    minor->debugfs_root, &vc4->load_tracker_enabled);
 
 	list_for_each_entry(entry, &vc4->debugfs_list, link) {
 		int ret = drm_debugfs_create_files(&entry->info, 1,