fix(ffi): correct race condition in pactffi_using_plugin
fix(ffi): correct race condition in pactffi_using_plugin

pact-foundation/pact-reference,pact-foundation/pact-reference,pact-foundation/pact-reference,pact-foundation/pact-reference,pact-foundation/pact-reference,pact-foundation/pact-reference,pact-foundation/pact-reference,pact-foundation/pact-reference