drm/i915: 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.

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: intel-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NJani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190613145229.21389-1-jani.nikula@intel.com

drivers/gpu/drm/i915/i915_debugfs.c

@@ -4444,23 +4444,17 @@ static const struct i915_debugfs_files {
 int i915_debugfs_register(struct drm_i915_private *dev_priv)
 {
 	struct drm_minor *minor = dev_priv->drm.primary;
-	struct dentry *ent;
 	int i;
 
-	ent = debugfs_create_file("i915_forcewake_user", S_IRUSR,
-				  minor->debugfs_root, to_i915(minor->dev),
-				  &i915_forcewake_fops);
-	if (!ent)
-		return -ENOMEM;
+	debugfs_create_file("i915_forcewake_user", S_IRUSR, minor->debugfs_root,
+			    to_i915(minor->dev), &i915_forcewake_fops);
 
 	for (i = 0; i < ARRAY_SIZE(i915_debugfs_files); i++) {
-		ent = debugfs_create_file(i915_debugfs_files[i].name,
-					  S_IRUGO | S_IWUSR,
-					  minor->debugfs_root,
-					  to_i915(minor->dev),
-					  i915_debugfs_files[i].fops);
-		if (!ent)
-			return -ENOMEM;
+		debugfs_create_file(i915_debugfs_files[i].name,
+				    S_IRUGO | S_IWUSR,
+				    minor->debugfs_root,
+				    to_i915(minor->dev),
+				    i915_debugfs_files[i].fops);
 	}
 
 	return drm_debugfs_create_files(i915_debugfs_list,