fs: remove needless assignment of null

This line `pool = null;` isn't needed and has been around since the first iteration of streams. I can't find a good reason for it to exist, it's not more readable, nor does it seem to trick the compiler into any optimizations. PR-URL: #10260 Reviewed-By: Anna Henningsen <[email protected]> Reviewed-By: Matteo Collina <[email protected]> Reviewed-By: Colin Ihrig <[email protected]> Reviewed-By: Italo A. Casas <[email protected]>

Author: reconbot

lib/fs.js

@@ -1791,7 +1791,6 @@ ReadStream.prototype._read = function(n){
 
 if(!pool||pool.length-pool.used<kMinPoolSpace){
 // discard the old pool.
-pool=null;
 allocNewPool(this._readableState.highWaterMark);
 }