scsi: pmcraid: Fix typo in comment

Spelling mistake (triple letters) in comment.  Detected with the help of
Coccinelle.

Link: https://lore.kernel.org/r/20220521111145.81697-89-Julia.Lawall@inria.fr


Signed-off-by: Julia Lawall <Julia.Lawall@inria.fr>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>