FD_ISSET must return an int. this is the easiest way.

FD_ISSET must return an int. this is the easiest way.

casting to int would not be correct because high bits could be lost.
mapping the high bits down onto low bits would be costlier in the
common case where the result is just used in a conditional. changing
the type of the bit array elements to int would permute the order of
the bit array on 64-bit big endian systems, so that's not an option
either.