Properly clean up on ssl_cert_dup failure.

Caught by scan-build.

Change-Id: I7c09b176d6a9e5d4fcd6e4fba184ac0679983cff
Reviewed-on: https://boringssl-review.googlesource.com/2200
Reviewed-by: Adam Langley <agl@google.com>
1 file changed