open_ibfile has an incorrect check for errors returned by open()

[GoogleCodeExporter]

open_ibfile assumes open() == 0 is an error. The correct check is open() < 0.

int open_ibfile(char *fname) {
        struct stat fstat;
        int fn;

        ...
        fn = open(fname, O_RDONLY, 0);
        if (!fn) error("Can't open file!");

Original issue reported on code.google.com by [email protected] on 8 Oct 2009 at 3:59