_alpm_pkg_dup leaves the destination pointer unaltered in case of fatal
errors, so when commits 2f0ca00e and be4198b3 freed the pointer, they
fixed a memory leak on non-fatal errors by replacing it with
a segmentation fault on fatal errors.
Signed-off-by: Andrew Gregory <andrew.gregory.8@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>