Valgrind : Leak Check : UMessageValidatorTest possible memleak

[BishrutSubedi]

To reproduce locally:

bash lint/valgrind.sh build/Release/bin/UMessageValidatorTest

Tool: LEAK CHECK
------------------------
FAILURE DETECTED: ==156307== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)

==146295==    definitely lost: 0 bytes in 0 blocks
==146295==    indirectly lost: 0 bytes in 0 blocks
==146295==      possibly lost: 190 bytes in 6 blocks
==146295==    still reachable: 15,107 bytes in 175 blocks
==146295==         suppressed: 0 bytes in 0 blocks
==146295== 
==146295== For lists of detected and suppressed errors, rerun with: -s
==146295== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)