Fix userland resource leaks

Coverity caught these. With the exception of the file descriptor leak in
tests/zfs-tests/cmd/draid.c, they are all memory leaks.

Also, there is a piece of dead code in zfs_get_enclosure_sysfs_path().
We delete it as cleanup.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Closes #13921

lib/libzfs/libzfs_dataset.c

@@ -2007,6 +2007,7 @@ zfs_prop_inherit(zfs_handle_t *zhp, const char *propname, boolean_t received)
 		goto error;
 
 	if ((ret = zfs_ioctl(zhp->zfs_hdl, ZFS_IOC_INHERIT_PROP, &zc)) != 0) {
+		changelist_free(cl);
 		return (zfs_standard_error(hdl, errno, errbuf));
 	} else {