HADOOP-16157. [Clean-up] Remove NULL check before instanceof in AzureNativeFileSystemStore

(Contributed by Shweta Yakkali via Daniel Templeton)

Change-Id: I6269ae66378e46eed440a76f847ae1af1fa95450

hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azure/AzureNativeFileSystemStore.java

@@ -1762,7 +1762,7 @@ public class AzureNativeFileSystemStore implements NativeFileSystemStore {
       throw new AzureException(e);
     } catch (IOException e) {
       Throwable t = e.getCause();
-      if (t != null && t instanceof StorageException) {
+      if (t instanceof StorageException) {
         StorageException se = (StorageException) t;
         // If we got this exception, the blob should have already been created
         if (!"LeaseIdMissing".equals(se.getErrorCode())) {
@@ -2638,7 +2638,7 @@ public class AzureNativeFileSystemStore implements NativeFileSystemStore {
       return delete(key, null);
     } catch (IOException e) {
       Throwable t = e.getCause();
-      if (t != null && t instanceof StorageException) {
+      if (t instanceof StorageException) {
         StorageException se = (StorageException) t;
         if ("LeaseIdMissing".equals(se.getErrorCode())){
           SelfRenewingLease lease = null;