va_end not used after va_copy

** CID 137204: API usage errors (VARARGS) /ep-engine/tests/module_tests/kvstore_test.cc: 455 in MockLogger::vatos(const char *, char *)()

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* CID 137204: API usage errors (VARARGS) /ep-engine/tests/module_tests/kvstore_test.cc: 455 in MockLogger::vatos(const char *, char *)() 449 // Calculate Size 450 va_copy(cpy, va); 451 buffer.resize(vsnprintf(nullptr, 0, fmt, cpy) + 1); 452 453 // Write to vector and return as string 454 vsnprintf(buffer.data(), buffer.size(), fmt, va);

CID 137204: API usage errors (VARARGS) va_end was not called for “cpy”.

455 return std::string(buffer.data()); 456 } 457 458 }; 459 460 /**