script: rename scriptpubkey_htlc_send to/recv bitcoin_redeem_htlc_send/recv

They could be scriptpubkeys, but they're actually used inside p2wsh,
so they're really witness scripts.  We use the term "redeem" elsewhere
from when we were using p2sh, though.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

bitcoin/script.c

@@ -286,7 +286,7 @@ u8 **bitcoin_witness_2of2(const tal_t *ctx,
 }
 
 /* Create a script for our HTLC output: sending. */
-u8 *scriptpubkey_htlc_send(const tal_t *ctx,
+u8 *bitcoin_redeem_htlc_send(const tal_t *ctx,
 			     const struct pubkey *ourkey,
 			     const struct pubkey *theirkey,
 			     const struct abs_locktime *htlc_abstimeout,
@@ -334,7 +334,7 @@ u8 *scriptpubkey_htlc_send(const tal_t *ctx,
 }
 
 /* Create a script for our HTLC output: receiving. */
-u8 *scriptpubkey_htlc_recv(const tal_t *ctx,
+u8 *bitcoin_redeem_htlc_recv(const tal_t *ctx,
 			     const struct pubkey *ourkey,
 			     const struct pubkey *theirkey,
 			     const struct abs_locktime *htlc_abstimeout,

bitcoin/script.h

@@ -50,7 +50,8 @@ void bitcoin_witness_p2sh_p2wpkh(const tal_t *ctx,
 /* Create scriptcode (fake witness, basically) for P2WPKH */
 u8 *p2wpkh_scriptcode(const tal_t *ctx, const struct pubkey *key);
 
-u8 *scriptpubkey_htlc_send(const tal_t *ctx,
+/* Create a script for our HTLC output: sending. */
+u8 *bitcoin_redeem_htlc_send(const tal_t *ctx,
 			     const struct pubkey *ourkey,
 			     const struct pubkey *theirkey,
 			     const struct abs_locktime *htlc_abstimeout,
@@ -59,7 +60,7 @@ u8 *scriptpubkey_htlc_send(const tal_t *ctx,
 			     const struct sha256 *rhash);
 
 /* Create a script for our HTLC output: receiving. */
-u8 *scriptpubkey_htlc_recv(const tal_t *ctx,
+u8 *bitcoin_redeem_htlc_recv(const tal_t *ctx,
 			     const struct pubkey *ourkey,
 			     const struct pubkey *theirkey,
 			     const struct abs_locktime *htlc_abstimeout,

commit_tx.c

@@ -82,7 +82,7 @@ struct bitcoin_tx *create_commit_tx(const tal_t *ctx,
 	for (i = 0; i < tal_count(cstate->a.htlcs); i++) {
 		if (!add_htlc(tx, num, &cstate->a.htlcs[i],
 			      our_final, their_final,
-			      rhash, their_locktime, scriptpubkey_htlc_send))
+			      rhash, their_locktime, bitcoin_redeem_htlc_send))
 			return tal_free(tx);
 		total += tx->output[num++].amount;
 	}
@@ -90,7 +90,7 @@ struct bitcoin_tx *create_commit_tx(const tal_t *ctx,
 	for (i = 0; i < tal_count(cstate->b.htlcs); i++) {
 		if (!add_htlc(tx, num, &cstate->b.htlcs[i],
 			      our_final, their_final,
-			      rhash, their_locktime, scriptpubkey_htlc_recv))
+			      rhash, their_locktime, bitcoin_redeem_htlc_recv))
 			return tal_free(tx);
 		total += tx->output[num++].amount;
 	}