fix: use optional chaining instead of validateBuffer

Author: wafuwafu13

lib/fs.js

@@ -619,7 +619,6 @@ function read(fd, buffer, offsetOrOptions, length, position, callback) {
         // This is fs.read(fd, params, callback)
         params = buffer;
         ({ buffer = Buffer.alloc(16384) } = params ?? kEmptyObject);
-        validateBuffer(buffer);
       }
       callback = offsetOrOptions;
     } else {
@@ -633,7 +632,7 @@ function read(fd, buffer, offsetOrOptions, length, position, callback) {
     }
     ({
       offset = 0,
-      length = buffer.byteLength - offset,
+      length = buffer?.byteLength - offset,
       position = null,
     } = params ?? kEmptyObject);
   }