HDFS-14438. Fix typo in OfflineEditsVisitorFactory. Contributed by bianqi.

hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineEditsViewer/OfflineEditsVisitorFactory.java

@@ -66,7 +66,7 @@ public class OfflineEditsVisitorFactory {
       } else if(StringUtils.equalsIgnoreCase("stats", processor)) {
         vis = new StatisticsEditsVisitor(out);
       } else {
-        throw new IOException("Unknown proccesor " + processor +
+        throw new IOException("Unknown processor " + processor +
           " (valid processors: xml, binary, stats)");
       }
       out = fout = null;