Remove old orig_fd variable from zfs send

Possibly required in the past, but is currently fills no purpose.
Ordinarily such tiny cleanup is not generally worth it, however
on the macOS port, in a future commit, we do unspeakable things to the
"fd" for send/recv, and it would be easier to only have to deal with
one "fd" instead of two.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Signed-off-by: Jorgen Lundman <lundman@lundman.net>
Closes openzfs#12404

lib/libzfs/libzfs_sendrecv.c

@@ -2403,7 +2403,6 @@ zfs_send_one(zfs_handle_t *zhp, const char *from, int fd, sendflags_t *flags,
 	int err;
 	libzfs_handle_t *hdl = zhp->zfs_hdl;
 	char *name = zhp->zfs_name;
-	int orig_fd = fd;
 	pthread_t ptid;
 	progress_arg_t pa = { 0 };
 
@@ -2535,7 +2534,7 @@ zfs_send_one(zfs_handle_t *zhp, const char *from, int fd, sendflags_t *flags,
 
 	if (flags->props || flags->holds || flags->backup) {
 		/* Write the final end record. */
-		err = send_conclusion_record(orig_fd, NULL);
+		err = send_conclusion_record(fd, NULL);
 		if (err != 0)
 			return (zfs_standard_error(hdl, err, errbuf));
 	}