FreeBSD: Remove stray debug printf

Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Signed-off-by: Doug Rabson <dfr@rabson.org>
Closes #14286 
Closes #14287

module/os/freebsd/zfs/kmod_core.c

@@ -133,18 +133,15 @@ zfsdev_ioctl(struct cdev *dev, ulong_t zcmd, caddr_t arg, int flag,
 	len = IOCPARM_LEN(zcmd);
 	vecnum = zcmd & 0xff;
 	zp = (void *)arg;
-	uaddr = (void *)zp->zfs_cmd;
 	error = 0;
 #ifdef ZFS_LEGACY_SUPPORT
 	zcl = NULL;
 #endif
 
-	if (len != sizeof (zfs_iocparm_t)) {
-		printf("len %d vecnum: %d sizeof (zfs_cmd_t) %ju\n",
-		    len, vecnum, (uintmax_t)sizeof (zfs_cmd_t));
+	if (len != sizeof (zfs_iocparm_t))
 		return (EINVAL);
-	}
 
+	uaddr = (void *)zp->zfs_cmd;
 	zc = kmem_zalloc(sizeof (zfs_cmd_t), KM_SLEEP);
 #ifdef ZFS_LEGACY_SUPPORT
 	/*