i2c: amd-asf: Set cmd variable when encountering an error

In the event of ASF error during the transfer, update the cmd and exit
the process, as data processing is not performed when a command fails.

Co-developed-by: Sanket Goswami <Sanket.Goswami@amd.com>
Signed-off-by: Sanket Goswami <Sanket.Goswami@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20250217090258.398540-2-Shyam-sundar.S-k@amd.com