s3:utils: Fix memory leaks in test_ntlm_in_both()

s3:utils: Fix memory leaks in test_ntlm_in_both()

Direct leak of 112 byte(s) in 1 object(s) allocated from:
    #0 0x7ff61d8fc777 in malloc ../../../../libsanitizer/asan/asan_malloc_linux.cpp:69
    #1 0x7ff61d450c57 in __talloc_with_prefix ../../lib/talloc/talloc.c:783
    #2 0x7ff61d452acf in __talloc ../../lib/talloc/talloc.c:825
    #3 0x7ff61d452acf in _talloc_named_const ../../lib/talloc/talloc.c:982
    #4 0x7ff61d452acf in _talloc_array ../../lib/talloc/talloc.c:2784
    #5 0x7ff61c9f6a99 in data_blob_talloc_named ../../lib/util/data_blob.c:58
    #6 0x7ff61c9f6b1b in data_blob_named ../../lib/util/data_blob.c:40
    #7 0x561cafffad96 in test_ntlm_in_both ../../source3/utils/ntlm_auth_diagnostics.c:285
    #8 0x561cafffc8d4 in diagnose_ntlm_auth ../../source3/utils/ntlm_auth_diagnostics.c:714
    #9 0x561cafff8efd in main ../../source3/utils/ntlm_auth.c:2855
    #10 0x7ff61a02a2ad in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58

Signed-off-by: Andreas Schneider <asn@samba.org>
Reviewed-by: Noel Power <npower@samba.org>