Remove dead code

Delete unused functions.

Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Closes #10470

lib/libzfs/os/freebsd/libzfs_compat.c

@@ -33,9 +33,6 @@
 #include <sys/stat.h>
 #include <sys/param.h>
 
-int zfs_ioctl_version = ZFS_IOCVER_UNDEF;
-// static int zfs_spa_version = -1;
-
 void
 libzfs_set_pipe_max(int infd)
 {
@@ -173,38 +170,6 @@ execvpe(const char *name, char * const argv[], char * const envp[])
 	return (execvPe(name, path, argv, envp));
 }
 
-#if 0
-/*
- * Get the SPA version
- */
-static int
-get_zfs_spa_version(void)
-{
-	size_t ver_size;
-	int ver = 0;
-
-	ver_size = sizeof (ver);
-	sysctlbyname("vfs.zfs.version.spa", &ver, &ver_size, NULL, 0);
-
-	return (ver);
-}
-#endif
-
-/*
- * Get zfs_ioctl_version
- */
-int
-get_zfs_ioctl_version(void)
-{
-	size_t ver_size;
-	int ver = ZFS_IOCVER_NONE;
-
-	ver_size = sizeof (ver);
-	sysctlbyname("vfs.zfs.version.ioctl", &ver, &ver_size, NULL, 0);
-
-	return (ver);
-}
-
 const char *
 libzfs_error_init(int error)
 {

lib/libzfs/os/freebsd/libzfs_zmount.c

@@ -135,14 +135,3 @@ zfs_mount_delegation_check(void)
 {
 	return (0);
 }
-
-/*
- * Check if we are doing an overlay mount.
- * Returns B_TRUE if the mount would overlay, otherwise B_FALSE.
- */
-boolean_t
-zfs_mount_overlay_check(const char *mountpoint)
-{
-	/* FreeBSD always allows overlay mounts. */
-	return (B_FALSE);
-}