staging: greybus: correct typo in comment

Correct misspelling in comment. Issue found with checkpatch.

Signed-off-by: Nickalas Cason <nickalas@cason.dev>
Link: https://lore.kernel.org/r/20220430230139.7i772mvejlhevamn@desktop


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>