module: zfs: fix unused, remove argsused

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12844

module/os/linux/zfs/vdev_file.c

@@ -298,10 +298,10 @@ vdev_file_io_start(zio_t *zio)
 	    TQ_SLEEP), !=, TASKQID_INVALID);
 }
 
-/* ARGSUSED */
 static void
 vdev_file_io_done(zio_t *zio)
 {
+	(void) zio;
 }
 
 vdev_ops_t vdev_file_ops = {

module/os/linux/zfs/zfs_racct.c

@@ -28,9 +28,11 @@
 void
 zfs_racct_read(uint64_t size, uint64_t iops)
 {
+	(void) size, (void) iops;
 }
 
 void
 zfs_racct_write(uint64_t size, uint64_t iops)
 {
+	(void) size, (void) iops;
 }

module/os/linux/zfs/zio_crypt.c

@@ -1776,6 +1776,7 @@ zio_crypt_init_uios_normal(boolean_t encrypt, uint8_t *plainbuf,
     uint8_t *cipherbuf, uint_t datalen, zfs_uio_t *puio, zfs_uio_t *cuio,
     uint_t *enc_len)
 {
+	(void) encrypt;
 	int ret;
 	uint_t nr_plain = 1, nr_cipher = 2;
 	iovec_t *plain_iovecs = NULL, *cipher_iovecs = NULL;