input: add void argument to input_pre_cb_collect()
input: add void argument to input_pre_cb_collect()

This fixes the following warning on MSVC:

    warning C4113: 'void (__cdecl *)()' differs in parameter
    lists from 'void (__cdecl *)(void)'

Since this function is passed to libco and cb_collect() expects a
function with void argument, we'd better add a explicit void here.

Signed-off-by: Fujimoto Seiji <ef879192bb1e41d519c82cf76440dc8e9a530806@clear-code.com>

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