only get the sources once, even if tidy_apt is called twice.

git-svn-id: http://emdebian.org/svn/current@7265 563faec7-e20c-0410-992a-a66f704d0ccd

multistrap

@@ -654,9 +654,9 @@ sub tidy_apt
 	print _g("I: Tidying up apt cache and list data.\n");
 	if (defined $sourcedir) {
 		my $str = join (" ", @dsclist);
-		print "$str\n";
 		print "(cd $sourcedir; apt-get -d $config_str source $str)";
 		system ("(cd $sourcedir; apt-get -d $config_str source $str)");
+		$sourcedir=undef;
 	}
 	unlink ("${dir}etc/apt/sources.list")
 		if (-f "${dir}etc/apt/sources.list");