memstick: ms_block: Fix spelling contraction "cant" -> "can't"

There is a spelling mistake in a pr_err message. Fix it.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20210728103254.171546-1-colin.king@canonical.com


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>