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The node (nd) may be NULL and pointer arithmetic on NULL is undefined
behavior. Move the computation of next below the NULL check on the
node.
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: James Clark <james.clark@arm.com>
Link: https://lore.kernel.org/r/20230914044233.1550195-1-irogers@google.com

Signed-off-by: Namhyung Kim <namhyung@kernel.org>