tk_choose_file 函数的返回值无法访问

[Gravity-of-eath]

这个GDB的调用栈
#0 __strcpy_avx2 () at ../sysdeps/x86_64/multiarch/strcpy-avx2.S:301
#1 0x00007ffff7baa9a4 in tk_strcpy (dst=0x55555555a040 "", src=0x56bdfe20 <error: Cannot access memory at address 0x56bdfe20>) at src/tkc/utils.c:310
#2 0x0000555555556d25 in on_open_click (ctx=0x555555e987c0, e=0x7fffffffcea0) at src/pages/home_page.c:24
#3 0x00007ffff7b76fbc in emitter_dispatch (emitter=0x555555e08860, e=0x7fffffffcea0) at src/tkc/emitter.c:131
#4 0x00007ffff7a45ecb in widget_dispatch (widget=0x555555e29730, e=0x7fffffffcea0) at src/base/widget.c:1367
#5 0x00007ffff79d1c0b in button_on_event (widget=0x555555e29730, e=0x7fffffffd3a0) at src/widgets/button.c:246
#6 0x00007ffff7a45e68 in widget_dispatch (widget=0x555555e29730, e=0x7fffffffd3a0) at src/base/widget.c:1357
#7 0x00007ffff7a4df13 in widget_on_pointer_up_after_children (widget=0x555555e29730, e=0x7fffffffd3a0) at src/base/widget.c:3240
#8 0x00007ffff7a4e0dd in widget_on_pointer_up_impl (widget=0x555555e29730, e=0x7fffffffd3a0) at src/base/widget.c:3262
#9 0x00007ffff7a4e17b in widget_on_pointer_up (widget=0x555555e29730, e=0x7fffffffd3a0) at src/base/widget.c:3271
#10 0x00007ffff7a4dedd in widget_on_pointer_up_children (widget=0x555555e83020, e=0x7fffffffd3a0) at src/base/widget.c:3231
#11 0x00007ffff7a4e06d in widget_on_pointer_up_impl (widget=0x555555e83020, e=0x7fffffffd3a0) at src/base/widget.c:3253
#12 0x00007ffff7a4e17b in widget_on_pointer_up (widget=0x555555e83020, e=0x7fffffffd3a0) at src/base/widget.c:3271
#13 0x00007ffff7a4dedd in widget_on_pointer_up_children (widget=0x555555e987c0, e=0x7fffffffd3a0) at src/base/widget.c:3231
#14 0x00007ffff7a4e06d in widget_on_pointer_up_impl (widget=0x555555e987c0, e=0x7fffffffd3a0) at src/base/widget.c:3253
#15 0x00007ffff7a4e17b in widget_on_pointer_up (widget=0x555555e987c0, e=0x7fffffffd3a0) at src/base/widget.c:3271
#16 0x00007ffff7a4dedd in widget_on_pointer_up_children (widget=0x55555557e220, e=0x7fffffffd3a0) at src/base/widget.c:3231
--Type for more, q to quit, c to continue without paging--Quit

[xianjimli]

我写了一个demo没发现问题，用valgrind也没有查出内存问题：
https://github.com/zlgopen/awtk-c-demos/blob/master/demos/file_pick.c