fix #561, uninitialised memory access

[zhaozg]

No description provided.

[squeek502]

This will fix the uninitialized reads, but is it actually okay for luv_cfpcall to be returning -1 when there are 0 values returned by the work_cb function?

luv/src/work.c

Line 96 in 727c6e4

i = luv_cfpcall(L, i, LUA_MULTRET, 0);

(more details at #561 (comment))

[zhaozg]

This will fix the uninitialized reads, but is it actually okay for luv_cfpcall to be returning -1 when there are 0 values returned by the work_cb function?

that because vm stack index(get_top after push err_funcs) not balance, fixed in
2d685c3

thank you very muach.