pack-objects: plug leak in `read_stdin_packs()`

The `read_stdin_packs()` function added originally via 339bce27f4f
(builtin/pack-objects.c: add '--stdin-packs' option, 2021-02-22)
declares a `rev_info` struct but neglects to call `release_revisions()`
on it before returning, creating the potential for a leak.

The related change in 97ec43247c0 (pack-objects: declare 'rev_info' for
'--stdin-packs' earlier, 2025-06-23) carried forward this oversight and
did not address it.

Ensure that we call `release_revisions()` appropriately to prevent a
potential leak from this function. Note that in practice our `rev_info`
here does not have a present leak, hence t5331 passes cleanly before
this commit, even when built with SANITIZE=leak.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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