[Storage] Fix an Azure File issue on SAS credential (#22297)

Author: blueww

src/Storage/Storage/Common/AzureStorageFileDirectory.cs

@@ -145,14 +145,14 @@ public AzureStorageFileDirectory(ShareDirectoryClient shareDirectoryClient, Azur
         // Convert Track2 File Dir object to Track 1 file Dir object
         public static CloudFileDirectory GetTrack1FileDirClient(ShareDirectoryClient shareFileDirClient, StorageCredentials credentials)
         {
-            if (credentials.IsSAS) // the Uri already contains credentail.
-            {
-                credentials = null;
-            }
             if (credentials.IsToken)
             {
                 return new InvalidCloudFileDirectory(shareFileDirClient.Uri, credentials);
             }
+            if (credentials.IsSAS) // the Uri already contains credentail.
+            {
+                credentials = null;
+            }
             CloudFileDirectory track1CloudFileDir;
             track1CloudFileDir = new CloudFileDirectory(shareFileDirClient.Uri, credentials);
             return track1CloudFileDir;

src/Storage/Storage/Common/AzureStorageFileShare.cs

@@ -230,14 +230,14 @@ public void UndeleteShare()
         // Convert Track2 File share object to Track 1 file share object
         public static CloudFileShare GetTrack1FileShareClient(ShareClient shareClient, StorageCredentials credentials)
         {
-            if (credentials.IsSAS) // the Uri already contains credentail.
-            {
-                credentials = null;
-            }
             if (credentials.IsToken)
             {
                 return new InvalidCloudFileShare(shareClient.Uri, credentials);
             }
+            if (credentials.IsSAS) // the Uri already contains credentail.
+            {
+                credentials = null;
+            }
             CloudFileShare track1CloudFileShare = new CloudFileShare(shareClient.Uri, credentials);
             return track1CloudFileShare;
         }