test-asan: use-after-free errors

[iamazeem]

Following tests are failing:

• test-sheet-pivot-1
• test-sheet-pivot-V
• test-sheet-sqlfilter-1

=================================================================
==ERROR: AddressSanitizer: heap-use-after-free on address 0x0a047fff81a2 at pc 0x559e48261000 bp 0x7f707be3a000 sp 0x7f707be39ff0
READ of size 8 at 0x0a047fff81a2 thread T2
    #0 0x559e48261000 in zsv_cache_load_props utils/prop.c:148

Thread T2 created by T0 here:
    #0 0x7f707be3af85 in __interceptor_pthread_create ../../../../src/libsanitizer/asan/asan_interceptors.cpp:207
    #1 0x559e48266993 in zsvsheet_ui_buffer_create_worker sheet/ui_buffer.c:79
    #2 0x559e48269a81 in get_data_index_async sheet/read-data.c:60
    #3 0x559e4826b802 in read_data sheet/read-data.c:271
    #4 0x559e482714be in zsvsheet_ui_buffer_open_file_opts sheet/file.c:13
    #5 0x559e48271cdd in zsvsheet_open_file_opts sheet/file.c:59
    #6 0x559e4827a62a in zsv_sqlite3_to_csv sheet/sheet-sql.c:53
    #7 0x559e4827ccb7 in zsvsheet_pivot_handler sheet/pivot.c:276
    #8 0x559e48263bce in zsvsheet_proc_invoke sheet/procedure.c:65
    #9 0x559e48263e20 in zsvsheet_proc_invoke_from_keypress sheet/procedure.c:78
    #10 0x559e4826c025 in zsvsheet_proc_key_binding_handler sheet/key-bindings.c:26
    #11 0x559e4826c8f0 in zsvsheet_key_press sheet/key-bindings.c:94
    #12 0x559e482806a3 in zsv_sheet_main app/sheet.c:1241
    #13 0x559e48261042 in main app/zsv_command_standalone.c:14
    #14 0x7f707ba71d8f in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58

SUMMARY: AddressSanitizer: heap-use-after-free utils/prop.c:148 in zsv_cache_load_props

Shadow bytes around the buggy address:
  0x0a047fff8150: fa fa fd fd fa fa fd fd fa fa 00 00 fa fa fd fd
  0x0a047fff8160: fa fa fd fd fa fa 00 00 fa fa 00 00 fa fa 00 00
  0x0a047fff8170: fa fa fd fd fa fa fd fd fa fa fd fd fa fa fd fd
  0x0a047fff8180: fa fa fd fd fa fa fd fd fa fa fd fd fa fa fd fd
  0x0a047fff8190: fa fa fd fd fa fa fd fd fa fa fd fd fa fa 00 fa
=>0x0a047fff81a0: fa fa [fd] fd fa fa fd fd fa fa fd fd fa fa fd fd
  0x0a047fff81b0: fa fa 03 fa fa fa 03 fa fa fa 03 fa fa fa 03 fa
=================================================================

[liquidaty]

Will review thank you