e2freefrag: Fix getopt bug on machines with unsigned chars

e2freefrag: Fix getopt bug on machines with unsigned chars

The getopt() function returns an int, not a char.  On systems where the
default char is unsigned (like ppc), we get weird behavior where -1 is
truncated to 0xff but compared to (int)-1.

Also fix this same bug for two test programs, test_rel and iscan,
which aren't currently used at the moment.

Addresses-Gentoo-Bug: #299386

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>