nit: use getters that guard against a nil pointer. (#6804)

modules/apps/transfer/types/msgs.go

@@ -124,10 +124,10 @@ func (msg MsgTransfer) validateForwarding() error {
 
 	if !msg.TimeoutHeight.IsZero() {
 		// when forwarding, the timeout height must not be set
-		return errorsmod.Wrapf(ErrInvalidPacketTimeout, "timeout height must be zero if forwarding path hops is not empty: %s, %s", msg.TimeoutHeight, msg.Forwarding.Hops)
+		return errorsmod.Wrapf(ErrInvalidPacketTimeout, "timeout height must be zero if forwarding path hops is not empty: %s, %s", msg.TimeoutHeight, msg.Forwarding.GetHops())
 	}
 
-	if msg.Forwarding.Unwind {
+	if msg.Forwarding.GetUnwind() {
 		if len(msg.GetCoins()) > 1 {
 			// When unwinding, we must have at most one token.
 			return errorsmod.Wrap(ibcerrors.ErrInvalidCoins, "cannot unwind more than one token")
@@ -154,15 +154,15 @@ func (msg MsgTransfer) HasForwarding() bool {
 		return false
 	}
 
-	return len(msg.Forwarding.Hops) > 0 || msg.Forwarding.Unwind
+	return len(msg.Forwarding.GetHops()) > 0 || msg.Forwarding.GetUnwind()
 }
 
 // validateIdentifiers validates the source port and channel identifiers based on the
 // forwarding information present in the message. If forwarding information is missing
 // or unwinding isn't performed, we do normal validation, else, we assert that both
 // fields must be empty.
 func (msg MsgTransfer) validateIdentifiers() error {
-	if msg.Forwarding != nil && msg.Forwarding.Unwind {
+	if msg.Forwarding.GetUnwind() {
 		if msg.SourcePort != "" {
 			return errorsmod.Wrapf(ErrInvalidForwarding, "source port must be empty when unwind is set, got %s instead", msg.SourcePort)
 		}

modules/apps/transfer/types/transfer_authorization.go

@@ -183,11 +183,11 @@ func validateForwarding(forwarding *Forwarding, allowedForwarding []AllowedForwa
 		return nil
 	}
 
-	if forwarding.Unwind {
+	if forwarding.GetUnwind() {
 		return errorsmod.Wrap(ErrInvalidForwarding, "not allowed automatic unwind")
 	}
 
-	if !isAllowedForwarding(forwarding.Hops, allowedForwarding) {
+	if !isAllowedForwarding(forwarding.GetHops(), allowedForwarding) {
 		return errorsmod.Wrapf(ErrInvalidForwarding, "not allowed hops %s", forwarding.Hops)
 	}