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 openzfs#14207

include/sys/zfs_acl.h

@@ -219,7 +219,7 @@ extern int zfs_zaccess(struct znode *, int, int, boolean_t, cred_t *,
     zuserns_t *);
 int zfs_fastaccesschk_execute(struct znode *, cred_t *);
 extern int zfs_zaccess_rwx(struct znode *, mode_t, int, cred_t *, zuserns_t *);
-extern int zfs_zaccess_unix(struct znode *, mode_t, cred_t *);
+extern int zfs_zaccess_unix(void *, int, cred_t *);
 extern int zfs_acl_access(struct znode *, int, cred_t *);
 int zfs_acl_chmod_setattr(struct znode *, zfs_acl_t **, uint64_t);
 int zfs_zaccess_delete(struct znode *, struct znode *, cred_t *, zuserns_t *);

module/os/freebsd/zfs/zfs_acl.c

@@ -2483,7 +2483,7 @@ zfs_zaccess_rwx(znode_t *zp, mode_t mode, int flags, cred_t *cr,
  * Access function for secpolicy_vnode_setattr
  */
 int
-zfs_zaccess_unix(znode_t *zp, mode_t mode, cred_t *cr)
+zfs_zaccess_unix(void *zp, int mode, cred_t *cr)
 {
 	int v4_mode = zfs_unix_to_v4(mode >> 6);
 

module/os/linux/zfs/zfs_acl.c

@@ -2788,7 +2788,7 @@ zfs_zaccess_rwx(znode_t *zp, mode_t mode, int flags, cred_t *cr,
  * Access function for secpolicy_vnode_setattr
  */
 int
-zfs_zaccess_unix(znode_t *zp, mode_t mode, cred_t *cr)
+zfs_zaccess_unix(void *zp, int mode, cred_t *cr)
 {
 	int v4_mode = zfs_unix_to_v4(mode >> 6);
 

module/os/linux/zfs/zfs_vnops_os.c

@@ -2186,7 +2186,7 @@ zfs_setattr(znode_t *zp, vattr_t *vap, int flags, cred_t *cr, zuserns_t *mnt_ns)
 			vap->va_mask &= ~trim_mask;
 		}
 		err = secpolicy_vnode_setattr(cr, ip, vap, &oldva, flags,
-		    (int (*)(void *, int, cred_t *))zfs_zaccess_unix, zp);
+		    zfs_zaccess_unix, zp);
 		if (err)
 			goto out3;
 

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);
 	}
 }