iwlwifi: always check that grab_nic_access succeeds

This allows to let sparse check that the NIC access is
always released.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --cc drivers/net/wireless/iwlwifi/dvm/main.c
Simple merge

diff --cc drivers/net/wireless/iwlwifi/dvm/tt.c
Simple merge

diff --cc drivers/net/wireless/iwlwifi/iwl-io.c
Simple merge

diff --cc drivers/net/wireless/iwlwifi/iwl-test.c
Simple merge

diff --cc drivers/net/wireless/iwlwifi/iwl-trans.h
Simple merge

diff --cc drivers/net/wireless/iwlwifi/pcie/trans.c
Simple merge