Bogusness may have happened using a variable assignment here before, but

Bogusness may have happened using a variable assignment here before, but
proper parens mean that fd is always set by open(2) [in any part of C],
and so we can accurately check for it returning -1, without feeling like
we need to initialise fd to -1 in its declaration.

In other words, fix a stylistic/bogus nit.