mmc: core: refactor mmc_request_done()

We have this construction:

if (a && b && !c)
   finalize;
else
   block;
   finalize;

Which is equivalent by boolean logic to:

if (!a || !b || c)
   block;
finalize;

Which is simpler code.

Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>