Issue #13109: Kill mutation for NestedIfDepthCheck

Author: Kevin222004

config/pitest-suppressions/pitest-coding-2-suppressions.xml

@@ -81,15 +81,6 @@
     <lineContent>final DetailAST firstNextNode = CheckUtil.getFirstNode(nextNode);</lineContent>
   </mutation>
 
-  <mutation unstable="false">
-    <sourceFile>NestedIfDepthCheck.java</sourceFile>
-    <mutatedClass>com.puppycrawl.tools.checkstyle.checks.coding.NestedIfDepthCheck</mutatedClass>
-    <mutatedMethod>beginTree</mutatedMethod>
-    <mutator>org.pitest.mutationtest.engine.gregor.mutators.experimental.MemberVariableMutator</mutator>
-    <description>Removed assignment to member variable depth</description>
-    <lineContent>depth = 0;</lineContent>
-  </mutation>
-
   <mutation unstable="false">
     <sourceFile>OneStatementPerLineCheck.java</sourceFile>
     <mutatedClass>com.puppycrawl.tools.checkstyle.checks.coding.OneStatementPerLineCheck</mutatedClass>

src/main/java/com/puppycrawl/tools/checkstyle/checks/coding/NestedIfDepthCheck.java

@@ -144,11 +144,6 @@ public int[] getRequiredTokens() {
         return new int[] {TokenTypes.LITERAL_IF};
     }
 
-    @Override
-    public void beginTree(DetailAST rootAST) {
-        depth = 0;
-    }
-
     @Override
     public void visitToken(DetailAST literalIf) {
         if (!CheckUtil.isElseIf(literalIf)) {