wifi: iwlwifi: use unsigned to silence a GCC 12 warning

GCC 12 says:

drivers/net/wireless/intel/iwlwifi/mvm/sta.c:1076:37: warning: array subscript -1 is below array bounds of ‘struct iwl_mvm_tid_data[9]’ [-Warray-bounds]
 1076 |                 if (mvmsta->tid_data[tid].state != IWL_AGG_OFF)
      |                     ~~~~~~~~~~~~~~~~^~~~~

Whatever, tid is a bit from for_each_set_bit(), it's clearly unsigned.
Acked-by: Kalle Valo <kvalo@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/wireless/intel/iwlwifi/mvm/sta.c

@@ -1058,7 +1058,7 @@ static bool iwl_mvm_remove_inactive_tids(struct iwl_mvm *mvm,
 					 unsigned long *unshare_queues,
 					 unsigned long *changetid_queues)
 {
-	int tid;
+	unsigned int tid;
 
 	lockdep_assert_held(&mvmsta->lock);
 	lockdep_assert_held(&mvm->mutex);