checkstyle fix

Author: Minni Mittal

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/protocolrecords/impl/pb/AllocateResponsePBImpl.java

@@ -429,7 +429,7 @@ public synchronized void setAMRMToken(Token amRMToken) {
   }
 
   @Override
-  public EnhancedHeadroom getEnhancedHeadroom() {
+  public synchronized EnhancedHeadroom getEnhancedHeadroom() {
     AllocateResponseProtoOrBuilder p = viaProto ? proto : builder;
     if (enhancedHeadroom != null) {
       return enhancedHeadroom;
@@ -442,7 +442,8 @@ public EnhancedHeadroom getEnhancedHeadroom() {
   }
 
   @Override
-  public void setEnhancedHeadroom(EnhancedHeadroom enhancedHeadroom) {
+  public synchronized void setEnhancedHeadroom(
+      EnhancedHeadroom enhancedHeadroom) {
     maybeInitBuilder();
     if (enhancedHeadroom == null) {
       builder.clearEnhancedHeadroom();

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-common/src/main/java/org/apache/hadoop/yarn/api/records/impl/pb/EnhancedHeadroomPBImpl.java

@@ -54,8 +54,9 @@ public int hashCode() {
 
   @Override
   public boolean equals(Object other) {
-    if (other == null)
+    if (other == null) {
       return false;
+    }
     if (other.getClass().isAssignableFrom(this.getClass())) {
       return this.getProto().equals(this.getClass().cast(other).getProto());
     }
@@ -72,8 +73,9 @@ private void mergeLocalToBuilder() {
   }
 
   private void mergeLocalToProto() {
-    if (viaProto)
+    if (viaProto) {
       maybeInitBuilder();
+    }
     mergeLocalToBuilder();
     proto = builder.build();
     viaProto = true;