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[ Upstream commit 6b207ce8a96a71e966831e3a13c38143ba9a73c1 ] dma_map_sg return 0 on error, fix the error check, and return -EIO to caller. Fixes: dbc049eee730 ("mailbox: Add driver for Broadcom FlexRM ring manager") Signed-off-by: Jack Wang <jinpu.wang@ionos.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org>