f remove redundant bits from mask

Author: dunxen

lightning/src/ln/inbound_payment.rs

@@ -298,8 +298,9 @@ pub(super) fn verify<L: Deref>(payment_hash: PaymentHash, payment_data: &msgs::F
 			}
 
 			min_final_cltv_expiry_delta = Some(min_final_cltv_expiry_delta_from_metadata(metadata_bytes));
-			// Zero out bits reserved for first 4 bits of `min_final_cltv_expiry_delta`.
-			amt_msat_bytes[0] &= 0b1110_0001;
+			// Zero out bits reserved for first 4 bits of `min_final_cltv_expiry_delta`, leaving one bit
+			// which is the most significant bit of `min_amt_msat`.
+			amt_msat_bytes[0] &= 0b0000_0001;
 			// Zero out bits reserved for the last 8 bits of `min_final_cltv_expiry_delta`.
 			expiry_bytes[0] &= 0;
 		},