wifi: iwlwifi: correctly reference TSO page information

The code got copied from get_workaround_page, but here p->page is the
correct way to reference the page.

Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Fixes: adc902ce ("wifi: iwlwifi: keep the TSO and workaround pages mapped")
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/r/202407062135.NNjnmMdR-lkp@intel.com/
Link: https://patch.msgid.link/20240709123149.1848315-1-benjamin@sipsolutions.net


Signed-off-by: Johannes Berg <johannes.berg@intel.com>