object-file: free(*contents) only in read_loose_object() caller

In the preceding commit a free() of uninitialized memory regression in
96e41f58fe1 (fsck: report invalid object type-path combinations,
2021-10-01) was fixed, but we'd still have an issue with leaking
memory from fsck_loose(). Let's fix that issue too.

That issue was introduced in my 31deb28f5e0 (fsck: don't hard die on
invalid object types, 2021-10-01). It can be reproduced under
SANITIZE=leak with the test I added in 093fffdfbec (fsck tests: add
test for fsck-ing an unknown type, 2021-10-01):

    ./t1450-fsck.sh --run=84 -vixd

In some sense it's not a problem, we lost the same amount of memory in
terms of things malloc'd and not free'd. It just moved from the "still
reachable" to "definitely lost" column in valgrind(1) nomenclature[1],
since we'd have die()'d before.

But now that we don't hard die() anymore in the library let's properly
free() it. Doing so makes this code much easier to follow, since we'll
now have one function owning the freeing of the "contents" variable,
not two.

For context on that memory management pattern the read_loose_object()
function was added in f6371f92104 (sha1_file: add read_loose_object()
function, 2017-01-13) and subsequently used in c68b489e564 (fsck:
parse loose object paths directly, 2017-01-13). The pattern of it
being the task of both sides to free() the memory has been there in
this form since its inception.

1. https://valgrind.org/docs/manual/mc-manual.html#mc-manual.leaks

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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