[MDEV-26761] main.mysql_client_test test_mdev19838 fails with MemorySanitizer - Jira

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This came up while I was working on ~~MDEV-26758~~. These tests used to fail with MemorySanitizer:

main.mysql_client_test_comp              w3 [ pass ]  43767

main.mysql_client_test_nonblock          w2 [ pass ]  44749

main.mysql_client_test                   w1 [ pass ]  44743

I suspect that fixing test_mdev19838() requires some changes in libmariadb itself. I am getting the following trace:

==WARNING: MemorySanitizer: use-of-uninitialized-value

    #0 0x55f050b09636 in madb_reset_stmt /mariadb/10.5m/libmariadb/libmariadb/mariadb_stmt.c:2159:15

    #1 0x55f050b04e7e in mysql_stmt_internal_reset /mariadb/10.5m/libmariadb/libmariadb/mariadb_stmt.c:2186:8

    #2 0x55f050b075e3 in mysql_stmt_close /mariadb/10.5m/libmariadb/libmariadb/mariadb_stmt.c:1400:7

    #3 0x55f050ac9524 in wrap_mysql_stmt_close /mariadb/10.5m/tests/nonblock-wrappers.h:369:1

    #4 0x55f050ac9524 in test_mdev19838 /mariadb/10.5m/tests/mysql_client_test.c:21259:5

    #5 0x55f05085e978 in main /mariadb/10.5m/tests/mysql_client_fw.c:1449:9

    #6 0x7f04193f1e49 in __libc_start_main csu/../csu/libc-start.c:314:16

    #7 0x55f0507d5869 in _start (/dev/shm/10.5msan/tests/mariadb-client-test+0x5b869)

  Uninitialized value was created by a heap allocation

    #0 0x55f0507e1cad in malloc (/dev/shm/10.5msan/tests/mariadb-client-test+0x67cad)

    #1 0x55f050af8a0c in ma_init_alloc_root /mariadb/10.5m/libmariadb/libmariadb/ma_alloc.c:36:18

For now, I will disable test_mdev19838() under MemorySanitizer. It was already disabled for the embedded server.

relates to

CONC-483 Workaround for MSAN bug needed

MDEV-19838 mariadb odbc driver 3.1.1-ga sometimes crashes mariadb-server 10.3.16

MDEV-26758 Make libmariadb run under MSAN

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