Fix the last two CFI callback prototype mismatches

There was the series from me a year ago which fixed most of the
callback vs implementation prototype mismatches. It was based on
running the CFI-enabled kernel (in permissive mode -- warning
instead of panic) and performing a full ZTS cycle, and then fixing
all of the problems caught by CFI.
Now, Clang 16-dev has new warning flag, -Wcast-function-type-strict,
which detect such mismatches at compile-time. It allows to find the
remaining issues missed by the first series.
There are only two of them left: one for the
secpolicy_vnode_setattr() callback and one for taskq_dispatch().
The fix is easy, since they are not used anywhere else.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Lobakin <alobakin@pm.me>
Closes #14207

module/zfs/txg.c

@@ -429,7 +429,7 @@ txg_quiesce(dsl_pool_t *dp, uint64_t txg)
 }
 
 static void
-txg_do_callbacks(list_t *cb_list)
+txg_do_callbacks(void *cb_list)
 {
 	dmu_tx_do_callbacks(cb_list, 0);
 
@@ -479,7 +479,7 @@ txg_dispatch_callbacks(dsl_pool_t *dp, uint64_t txg)
 
 		list_move_tail(cb_list, &tc->tc_callbacks[g]);
 
-		(void) taskq_dispatch(tx->tx_commit_cb_taskq, (task_func_t *)
+		(void) taskq_dispatch(tx->tx_commit_cb_taskq,
 		    txg_do_callbacks, cb_list, TQ_SLEEP);
 	}
 }