do not run pager with diff --no-index --quiet

There is no point in running a pager when --quiet is given, since we are producing no output. The regular diff code path handles this already, because --quiet implies --exit-code, and we check for --exit-code when deciding not to run the pager. However, the "quiet implies exit-code" logic is done in diff_setup_done, and the no-index code path sets up its pager before running diff_setup_done, and misses this case. We can fix this by reordering our initialization. Currently we do: 1. read command line arguments into diff_options 2. Set pager if EXIT_CODE not requested 3. always set EXIT_CODE, since we are emulating traditional diff 4. call diff_setup_done We can fix the problem by moving pager initialization (step 2) after step 4. But step 3 must come after step 2 (since we want to know whether the _user_ requested --exit-code, not whether we turned it on unconditionally). So we must move both. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>