ntdll: tests/env.c: Initialize buffers to size tested in memcmp in testQuery

[Zac Brown]

Initialize buffers to size tested in memcmp for each iteration of loop in testQuery.

Fixes valgrind errors like:
Conditional jump or move depends on uninitialised value(s)
     at  testQuery (env.c:110)
     by  func_env (env.c:287)
     by  run_test (test.h:449)
     by  main (test.h:498)
   Uninitialised value was created by a stack allocation
     at  testQuery (env.c:53)

-Zac Brown
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