comedi: remove redundant assignment to variable buffer_config

Variable buffer_config is being assigned a value that is never read, it
is being re-assigned later on. The assignment is redundant and can be
removed.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20220130232910.9313-1-colin.i.king@gmail.com


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