The memory allocated with devm_kzalloc() is freed automatically no need to
explicitly call devm_kfree(). Delete it and save some instruction cycles.

Link: https://lore.kernel.org/r/20210112092128.19295-1-huobean@gmail.comReviewed-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>