drm/msm: make fb debugfs file available only in KMS case

Don't register the 'fb' debugfs file, if there is no KMS (and so no
framebuffers).
Reviewed-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/561650/Signed-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/msm_debugfs.c

@@ -266,6 +266,9 @@ static int msm_fb_show(struct seq_file *m, void *arg)
 static struct drm_info_list msm_debugfs_list[] = {
 		{"gem", msm_gem_show},
 		{ "mm", msm_mm_show },
+};
+
+static struct drm_info_list msm_kms_debugfs_list[] = {
 		{ "fb", msm_fb_show },
 };
 
@@ -314,9 +317,13 @@ void msm_debugfs_init(struct drm_minor *minor)
 	debugfs_create_file("gpu", S_IRUSR, minor->debugfs_root,
 		dev, &msm_gpu_fops);
 
-	if (priv->kms)
+	if (priv->kms) {
+		drm_debugfs_create_files(msm_kms_debugfs_list,
+					 ARRAY_SIZE(msm_kms_debugfs_list),
+					 minor->debugfs_root, minor);
 		debugfs_create_file("kms", S_IRUSR, minor->debugfs_root,
 				    dev, &msm_kms_fops);
+	}
 
 	debugfs_create_u32("hangcheck_period_ms", 0600, minor->debugfs_root,
 		&priv->hangcheck_period);