Ensure dbpath is not null when populating sync database

We didn't do this sanity check before trying to open an archive. If
the alpm dbpath wasn't set, the sync database dbpath would be NULL,
causing us to hang indefinitely in archive_read_open_filename() rather
than erroring out.

We already have a corresponding check in local_db_populate().

The following program will test this case, and hangs before this patch
without the call to set_dbpath:

	int main(int argc, char *argv[]) {
		alpm_initialize();
		// alpm_option_set_dbpath("/var/lib/pacman/");
		pmdb_t *core = alpm_db_register_sync("core");
		pmpkg_t *pkg = alpm_db_get_pkg(core, "pacman");
		return 0;
	}

Signed-off-by: Dan McGee <dan@archlinux.org>

0 files changed, 0 insertions, 0 deletions