fs: remove unnecessary ?? operator

This was introduced in 57678e5

With the `if` conditional around this statement, `options` will always
be evaluated as truthy. That means that the nullish coalescing operator
will always evaluate to the left side, make it unnecessary.

PR-URL: nodejs/node#43073
Reviewed-By: Zeyu "Alex" Yang <[email protected]>
Reviewed-By: Tobias Nießen <[email protected]>
Reviewed-By: LiviaMedeiros <[email protected]>
Reviewed-By: Darshan Sen <[email protected]>
Reviewed-By: Luigi Pinca <[email protected]>
Reviewed-By: Colin Ihrig <[email protected]>
Reviewed-By: Anto Aravinth <[email protected]>
Reviewed-By: Akhil Marsonya <[email protected]>

lib/internal/fs/promises.js

@@ -478,7 +478,7 @@ async function read(handle, bufferOrParams, offset, length, position) {
       offset = 0,
       length = buffer.byteLength - offset,
       position = null,
-    } = offset ?? ObjectCreate(null));
+    } = offset);
   }
 
   if (offset == null) {