drm/sprd: check the platform_get_resource() return value
platform_get_resource() may fail and return NULL, so check it's value before using it. Reported-by:Zou Wei <zou_wei@huawei.com> Signed-off-by:
Kevin Tang <kevin3.tang@gmail.com> Reviewed-by:
Javier Martinez Canillas <javierm@redhat.com> Acked-by:
Thomas Zimmermann <tzimmermann@suse.de> Link: https://lore.kernel.org/all/20220117084156.9338-1-kevin3.tang@gmail.com v1 -> v2: - new patch
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