Fix rsa_pss_to_ctx return value.

It should return 0 for failure, not -1; the call site was expecting 0 anyway.

Change-Id: I24ab5d3695b8ac438e40be1a4fd74ecd3b845f5a
Reviewed-on: https://boringssl-review.googlesource.com/1914
Reviewed-by: Adam Langley <agl@google.com>
1 file changed