refactor: switch s2n_blob to use S2N_RESULT

[jmayclin]

Resolved issues:

chips away at #2425

Description of changes:

This PR switches s2n_blob methods to use s2n_result.

There are 5 manual changes

• utils/s2n_blob.c: switch all implementations to use s2n_result with the appropriate guard changes
• utils/s2n_blob.h: switch the header to match the implementation
• tls/s2n_async_pkey.c:141: There was a manual comparison with S2N_SUCCESS, switched to use s2n_result_is_error
• utils/s2n_mem.c:s2n_free(305): the return type is stored, so the type of that variable had to be changed
• utils/s2n_mem.c:s2n_free_or_wipe(333): the return type is stored, so the type of that variable had to be change.

All other changes were made with the following sed commands.

find . -type f -exec sed -i 's/POSIX_GUARD(s2n_blob/POSIX_GUARD_RESULT(s2n_blob/g' {} +
find . -type f -exec sed -i 's/PTR_GUARD_POSIX(s2n_blob/PTR_GUARD_RESULT(s2n_blob/g' {} +
find . -type f -exec sed -i 's/RESULT_GUARD(s2n_blob/RESULT_GUARD(s2n_blob/g' {} +
find . -type f -exec sed -i 's/EXPECT_SUCCESS(s2n_blob/EXPECT_OK(s2n_blob/g' {} +

Call-outs:

Draft note: It would be lovely to make this a completely automated PR, but I don't see an easy way to do that and keep things compiling. ☹️

Testing:

All existing tests should pass.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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