staging: r8188eu: reduce variables in block_write()

For cleaner code and improved readability we can reduce the number
of local variables in block_write(). Use a single variable for block
size, number of blocks and remaining size.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220412185754.8695-5-straube.linux@gmail.com


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