[openwrt/openwrt] layerscape: Fix check after kernel update

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch openwrt-19.07:
https://git.openwrt.org/2a8279c161efeb243084d78d8077661c9122bb18

commit 2a8279c161efeb243084d78d8077661c9122bb18
Author: Hauke Mehrtens <hauke at hauke-m.de>
AuthorDate: Thu Nov 5 23:42:51 2020 +0100

    layerscape: Fix check after kernel update
    
    The fsl_destroy_mc_io() function was moved, add the new checks to the
    moved copy and not just remove it.
    
    Fixes: ac5297340e64 ("kernel: bump 4.14 to 4.14.206")
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
---
 .../layerscape/patches-4.14/708-mc-bus-support-layerscape.patch  | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/target/linux/layerscape/patches-4.14/708-mc-bus-support-layerscape.patch b/target/linux/layerscape/patches-4.14/708-mc-bus-support-layerscape.patch
index 7c6e25b038..2cc78a557a 100644
--- a/target/linux/layerscape/patches-4.14/708-mc-bus-support-layerscape.patch
+++ b/target/linux/layerscape/patches-4.14/708-mc-bus-support-layerscape.patch
@@ -8911,7 +8911,7 @@ Signed-off-by: Stuart Yoder <stuart.yoder at nxp.com>
 -EXPORT_SYMBOL_GPL(fsl_mc_portal_reset);
 --- /dev/null
 +++ b/drivers/bus/fsl-mc/mc-io.c
-@@ -0,0 +1,281 @@
+@@ -0,0 +1,286 @@
 +// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
 +/*
 + * Copyright 2013-2016 Freescale Semiconductor Inc.
@@ -9043,7 +9043,12 @@ Signed-off-by: Stuart Yoder <stuart.yoder at nxp.com>
 + */
 +void fsl_destroy_mc_io(struct fsl_mc_io *mc_io)
 +{
-+	struct fsl_mc_device *dpmcp_dev = mc_io->dpmcp_dev;
++	struct fsl_mc_device *dpmcp_dev;
++
++	if (!mc_io)
++		return;
++
++	dpmcp_dev = mc_io->dpmcp_dev;
 +
 +	if (dpmcp_dev)
 +		fsl_mc_io_unset_dpmcp(mc_io);