staging: comedi: mf6x4: change type of local variable

For aesthetics, change the type of this local variable to unsigned int.

This fixes the checkpatch.pl issue about:
CHECK: Prefer kernel type 'u32' over 'uint32_t'

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
 drivers/staging/comedi/drivers/mf6x4.c | 60 +++++++++++++++++-----------------
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>