fuzz: change return values to 1 rather than 0 or -1

This allows gofuzz to store the mutating input as coverage if it reaches
any new coverage, even if it didn't make it to the end of the test.

fuzz/lnwire/accept_channel.go

@@ -32,7 +32,7 @@ func Fuzz_accept_channel(data []byte) int {
 	payloadLen := uint32(len(data)) - 2
 	if payloadLen > emptyMsg.MaxPayloadLength(0) {
 		// Ignore this input - max payload constraint violated.
-		return -1
+		return 1
 	}
 
 	msg, err := lnwire.ReadMessage(r, 0)
@@ -40,7 +40,7 @@ func Fuzz_accept_channel(data []byte) int {
 		// go-fuzz generated []byte that cannot be represented as a
 		// wire message but we will return 0 so go-fuzz can modify the
 		// input.
-		return 0
+		return 1
 	}
 
 	// We will serialize the message into a new bytes buffer.

fuzz/lnwire/fuzz_utils.go

@@ -35,7 +35,7 @@ func harness(data []byte, emptyMsg lnwire.Message) int {
 	payloadLen := uint32(len(data)) - 2
 	if payloadLen > emptyMsg.MaxPayloadLength(0) {
 		// Ignore this input - max payload constraint violated.
-		return -1
+		return 1
 	}
 
 	msg, err := lnwire.ReadMessage(r, 0)
@@ -43,7 +43,7 @@ func harness(data []byte, emptyMsg lnwire.Message) int {
 		// go-fuzz generated []byte that cannot be represented as a
 		// wire message but we will return 0 so go-fuzz can modify the
 		// input.
-		return 0
+		return 1
 	}
 
 	// We will serialize the message into a new bytes buffer.

fuzz/lnwire/node_announcement.go

@@ -32,7 +32,7 @@ func Fuzz_node_announcement(data []byte) int {
 	payloadLen := uint32(len(data)) - 2
 	if payloadLen > emptyMsg.MaxPayloadLength(0) {
 		// Ignore this input - max payload constraint violated.
-		return -1
+		return 1
 	}
 
 	msg, err := lnwire.ReadMessage(r, 0)
@@ -40,7 +40,7 @@ func Fuzz_node_announcement(data []byte) int {
 		// go-fuzz generated []byte that cannot be represented as a
 		// wire message but we will return 0 so go-fuzz can modify the
 		// input.
-		return 0
+		return 1
 	}
 
 	// We will serialize the message into a new bytes buffer.

fuzz/lnwire/open_channel.go

@@ -32,7 +32,7 @@ func Fuzz_open_channel(data []byte) int {
 	payloadLen := uint32(len(data)) - 2
 	if payloadLen > emptyMsg.MaxPayloadLength(0) {
 		// Ignore this input - max payload constraint violated.
-		return -1
+		return 1
 	}
 
 	msg, err := lnwire.ReadMessage(r, 0)
@@ -40,7 +40,7 @@ func Fuzz_open_channel(data []byte) int {
 		// go-fuzz generated []byte that cannot be represented as a
 		// wire message but we will return 0 so go-fuzz can modify the
 		// input.
-		return 0
+		return 1
 	}
 
 	// We will serialize the message into a new bytes buffer.