Update LeafListImpl.java

[xinghaiquedeng]

fix bug

[lllyfeng]

why the yang context is null?

[xinghaiquedeng]

why the yang context is null?

yang-transformer is NullPointerException:
20231108\yang-transformer1.3.0>java -jar yang-transformer-1.0-SNAPSHOT.jar -src yang -out yang_trans
Exception in thread "main" java.lang.NullPointerException
at org.yangcentral.yangkit.model.impl.stmt.YangStatementImpl.initSelf(YangStatementImpl.java:767)
at org.yangcentral.yangkit.model.impl.stmt.YangBuiltInStatementImpl.initSelf(YangBuiltInStatementImpl.java:34)
at org.yangcentral.yangkit.model.impl.stmt.MaxElementsImpl.initSelf(MaxElementsImpl.java:33)
at org.yangcentral.yangkit.model.impl.stmt.YangStatementImpl.init(YangStatementImpl.java:806)
at org.yangcentral.yangkit.model.impl.stmt.LeafListImpl.initSelf(LeafListImpl.java:194)
at org.yangcentral.yangkit.model.impl.stmt.YangStatementImpl.init(YangStatementImpl.java:806)
at org.yangcentral.yangkit.model.impl.stmt.YangStatementImpl.initChildren(YangStatementImpl.java:741)
at org.yangcentral.yangkit.model.impl.stmt.YangStatementImpl.init(YangStatementImpl.java:812)
at org.yangcentral.yangkit.model.impl.stmt.YangStatementImpl.initChildren(YangStatementImpl.java:741)
at org.yangcentral.yangkit.model.impl.stmt.YangStatementImpl.init(YangStatementImpl.java:812)
at org.yangcentral.yangkit.model.impl.stmt.YangStatementImpl.initChildren(YangStatementImpl.java:741)
at org.yangcentral.yangkit.model.impl.stmt.YangStatementImpl.init(YangStatementImpl.java:812)
at org.yangcentral.yangkit.model.impl.stmt.YangStatementImpl.initChildren(YangStatementImpl.java:741)
at org.yangcentral.yangkit.model.impl.stmt.YangStatementImpl.init(YangStatementImpl.java:812)
at org.yangcentral.yangkit.model.impl.schema.YangSchemaContextImpl.validate(YangSchemaContextImpl.java:286)
at com.huawei.yang.transformer.YangTransformer.main(YangTransformer.java:1578)

Caused by：

deviation "/ipsec:ipsec/ipsec:ipsec-proposals/ipsec:ipsec-proposal/ipsec:ah-auth-algorithm" {
deviate add {
default "SHA2-256";
}

deviate add {
  max-elements 1;
}

}