libzfs: sendrecv: always cancel progress thread in zfs_send_one()

This is in line with all the other uses of the progress thread

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #11560
Closes #13284

lib/libzfs/libzfs_sendrecv.c

@@ -2522,7 +2522,6 @@ zfs_send_one(zfs_handle_t *zhp, const char *from, int fd, sendflags_t *flags,
 
 	if (flags->progress) {
 		void *status = NULL;
-		if (err != 0)
 		(void) pthread_cancel(ptid);
 		(void) pthread_join(ptid, &status);
 		int error = (int)(uintptr_t)status;