HBASE-28621 Fixed checkstyle warnings in PrefixFilter

(blocks) NeedBraces: 'if' construct must use '{}'s.

hbase-client/src/main/java/org/apache/hadoop/hbase/filter/PrefixFilter.java

@@ -52,10 +52,16 @@ public byte[] getPrefix() {
 
  @Override
  public boolean filterRowKey(Cell firstRowCell) {
- if (firstRowCell == null || this.prefix == null) return true;
- if (filterAllRemaining()) return true;
+ if (firstRowCell == null || this.prefix == null) {
+ return true;
+ }
+ if (filterAllRemaining()) {
+ return true;
+ }
  int length = firstRowCell.getRowLength();
- if (length < prefix.length) return true;
+ if (length < prefix.length) {
+ return true;
+ }
  // if they are equal, return false => pass row
  // else return true, filter row
  // if we are passed the prefix, set flag
@@ -113,7 +119,9 @@ public static Filter createFilterFromArguments(ArrayList<byte[]> filterArguments
  @Override
  public byte[] toByteArray() {
  FilterProtos.PrefixFilter.Builder builder = FilterProtos.PrefixFilter.newBuilder();
- if (this.prefix != null) builder.setPrefix(UnsafeByteOperations.unsafeWrap(this.prefix));
+ if (this.prefix != null) {
+ builder.setPrefix(UnsafeByteOperations.unsafeWrap(this.prefix));
+ }
  return builder.build().toByteArray();
  }