Fix memory leak with fs.writeSync

src/node_file.cc

@@ -556,11 +556,8 @@ static Handle<Value> Write(const Arguments& args) {
     return Undefined();
 
   } else {
-    if (pos < 0) {
-      written = write(fd, buf, len);
-    } else {
-      written = pwrite(fd, buf, len, pos);
-    }
+    written = pos < 0 ? write(fd, buf, len) : pwrite(fd, buf, len, pos);
+    delete [] reinterpret_cast<char*>(buf);
     if (written < 0) return ThrowException(ErrnoException(errno));
     return scope.Close(Integer::New(written));
   }