style: include RCN_REDUNDANT_NULLCHECK_OF_NONNULL_VALUE (#6559)

Author: vil02

spotbugs-exclude.xml

@@ -80,9 +80,6 @@
     <Match>
         <Bug pattern="SA_FIELD_SELF_ASSIGNMENT" />
     </Match>
-    <Match>
-        <Bug pattern="RCN_REDUNDANT_NULLCHECK_OF_NONNULL_VALUE" />
-    </Match>
     <Match>
         <Bug pattern="AT_STALE_THREAD_WRITE_OF_PRIMITIVE" />
     </Match>

src/main/java/com/thealgorithms/datastructures/caches/LFUCache.java

@@ -132,7 +132,7 @@ public void put(K key, V value) {
     private void addNodeWithUpdatedFrequency(Node node) {
         if (tail != null && head != null) {
             Node temp = this.head;
-            while (temp != null) {
+            while (true) {
                 if (temp.frequency > node.frequency) {
                     if (temp == head) {
                         node.next = temp;