TLS Test leak

[achamayou]

https://dev.azure.com/MSRC-CCF/CCF/_build/results?buildId=15175&view=logs&j=88dd69b5-c778-5f1c-f9ac-1398f4203929&t=f18b20af-6d89-55d5-5278-1002871723a4

19: ==1364==ERROR: LeakSanitizer: detected memory leaks
19:
19: Direct leak of 344 byte(s) in 1 object(s) allocated from:
19: #0 0x521d1a in calloc (/mnt/build/2/s/build/tls_test+0x521d1a)
19: #1 0x8725d2 in eckey_alloc_wrap (/mnt/build/2/s/build/tls_test+0x8725d2)
19:
19: Indirect leak of 104 byte(s) in 3 object(s) allocated from:
19: #0 0x521d1a in calloc (/mnt/build/2/s/build/tls_test+0x521d1a)
19: #1 0x860de2 in mbedtls_mpi_grow (/mnt/build/2/s/build/tls_test+0x860de2)
19:
19: SUMMARY: AddressSanitizer: 448 byte(s) leaked in 4 allocation(s).