Revert "drm/omapdrm: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL_BEGIN()"

This reverts commit 6067fddc.

This patchset breaks on intel platforms and was previously NACK'd by
Ville.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Fernando Ramos <greenfoo@u92.eu>
Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20211002154542.15800-8-sean@poorly.run

drivers/gpu/drm/omapdrm/omap_fb.c

@@ -9,7 +9,6 @@
 #include <drm/drm_modeset_helper.h>
 #include <drm/drm_fourcc.h>
 #include <drm/drm_gem_framebuffer_helper.h>
-#include <drm/drm_drv.h>
 
 #include "omap_dmm_tiler.h"
 #include "omap_drv.h"
@@ -63,17 +62,15 @@ static int omap_framebuffer_dirty(struct drm_framebuffer *fb,
 				  unsigned num_clips)
 {
 	struct drm_crtc *crtc;
-	struct drm_modeset_acquire_ctx ctx;
-	int ret;
 
-	DRM_MODESET_LOCK_ALL_BEGIN(fb->dev, ctx, 0, ret);
+	drm_modeset_lock_all(fb->dev);
 
 	drm_for_each_crtc(crtc, fb->dev)
 		omap_crtc_flush(crtc);
 
-	DRM_MODESET_LOCK_ALL_END(fb->dev, ctx, ret);
+	drm_modeset_unlock_all(fb->dev);
 
-	return ret;
+	return 0;
 }
 
 static const struct drm_framebuffer_funcs omap_framebuffer_funcs = {