closing: initialize feerange->allow_mistakes.

This exists for compatiblity with older versions, but it's currently
uninitialized.

Fixed-by: @ZmnSCPxj

closingd/closing.c

@@ -338,7 +338,8 @@ struct feerange {
 
 static void init_feerange(struct feerange *feerange,
 			  u64 commitment_fee,
-			  const u64 offer[NUM_SIDES])
+			  const u64 offer[NUM_SIDES],
+			  bool allow_mistakes)
 {
 	feerange->min = 0;
 
@@ -349,6 +350,7 @@ static void init_feerange(struct feerange *feerange,
          *    in [BOLT #3](03-transactions.md#fee-calculation).
 	 */
 	feerange->max = commitment_fee;
+	feerange->allow_mistakes = allow_mistakes;
 
 	if (offer[LOCAL] > offer[REMOTE])
 		feerange->higher_side = LOCAL;
@@ -526,7 +528,7 @@ int main(int argc, char *argv[])
 	}
 
 	/* Now we have first two points, we can init fee range. */
-	init_feerange(&feerange, commitment_fee, offer);
+	init_feerange(&feerange, commitment_fee, offer, deprecated_api);
 
 	/* Now apply the one constraint from above (other is inside loop). */
 	adjust_feerange(&cs, gossip_index, &channel_id, &feerange,