graphics/mesa-devel: crash workaround for Intel GPUs after r553723

While upstream issue is in userland driver FreeBSD kernel driver may
fail to handle it gracefully e.g.,

  $ sway
  $ mpv --hwdec=vaapi /path/to/file

  pid 12449 (sway), jid 0, uid 1234: exited on signal 11
  WARNING !drm_modeset_is_locked(&crtc->mutex) failed at drm-kmod-drm_v5.4.62_3/drivers/gpu/drm/drm_atomic_helper.c:621
  #0 0xffffffff81f3e833 at linux_dump_stack+0x23
  #1 0xffffffff81ea43e3 at drm_atomic_helper_check_modeset+0xb3
  #2 0xffffffff8259492c at intel_atomic_check+0x8c
  #3 0xffffffff81ea3379 at drm_atomic_check_only+0x3f9
  #4 0xffffffff81ea37c3 at drm_atomic_commit+0x13
  #5 0xffffffff81eb0c3f at drm_client_modeset_commit_atomic+0x1af
  #6 0xffffffff81eb093a at drm_client_modeset_commit_force+0x6a
  #7 0xffffffff81efa12a at drm_fb_helper_restore_fbdev_mode_unlocked+0x7a
  #8 0xffffffff81ef2386 at vt_kms_postswitch+0x166
  #9 0xffffffff8076b66b at vt_window_switch+0x12b
  #10 0xffffffff807688ff at vtterm_cngrab+0x1f
  #11 0xffffffff80805a36 at cngrab+0x16
  #12 0xffffffff8086295c at vpanic+0xec
  #13 0xffffffff80862863 at panic+0x43
  #14 0xffffffff81f5d142 at dma_buf_poll+0x12
  #15 0xffffffff808d2959 at kern_poll+0x329
  #16 0xffffffff808d2620 at sys_poll+0x50
  #17 0xffffffff80b3353b at amd64_syscall+0xfb

graphics/mesa-devel/Makefile

@@ -3,6 +3,7 @@
 PORTNAME=	mesa
 DISTVERSION=	20.2-branchpoint-3613
 DISTVERSIONSUFFIX=	-g0a4c1db926c
+PORTREVISION=	1
 CATEGORIES=	graphics
 PKGNAMESUFFIX=	-devel
 

graphics/mesa-devel/files/patch-revert

@@ -0,0 +1,45 @@
+Revert https://gitlab.freedesktop.org/mesa/mesa/-/commit/13859c769f0e
+due to https://gitlab.freedesktop.org/mesa/mesa/-/issues/3713
+
+--- src/gallium/frontends/dri/dri2.c.orig	2020-10-31 00:18:11 UTC
++++ src/gallium/frontends/dri/dri2.c
+@@ -1379,28 +1379,18 @@ static __DRIimage *
+ dri2_from_planar(__DRIimage *image, int plane, void *loaderPrivate)
+ {
+    __DRIimage *img;
+-   struct pipe_resource *tex = image->texture;
+-   int i;
+
+    if (plane < 0) {
+       return NULL;
+    } else if (plane > 0) {
+       uint64_t planes;
+-      if (dri2_resource_get_param(image, PIPE_RESOURCE_PARAM_NPLANES, 0,
+-                                  &planes) &&
++      if (!dri2_resource_get_param(image, PIPE_RESOURCE_PARAM_NPLANES, 0,
++                                   &planes) ||
+           plane >= planes) {
+          return NULL;
+       }
+    }
+
+-   if (tex->next) {
+-      for (i = 0; i < plane; i++) {
+-         tex = tex->next;
+-         if (!tex)
+-            return NULL;
+-      }
+-   }
+-
+    if (image->dri_components == 0) {
+       uint64_t modifier;
+       if (!dri2_resource_get_param(image, PIPE_RESOURCE_PARAM_MODIFIER, 0,
+@@ -1413,8 +1403,6 @@ dri2_from_planar(__DRIimage *image, int plane, void *l
+    img = dri2_dup_image(image, loaderPrivate);
+    if (img == NULL)
+       return NULL;
+-
+-   pipe_resource_reference(&img->texture, tex);
+
+    if (img->texture->screen->resource_changed)
+       img->texture->screen->resource_changed(img->texture->screen,