libdisasm: Don't depend on sizeof(void)
libdisasm: Don't depend on sizeof(void)

Due to operator precedence, the address was first cast to void*
and then incremented, which resulted in an error on windows, as
sizeof(void) is undefined and MSVC takes this seriously. Changing
the precedence to perform the addition first.

R=mark@chromium.org

Review URL: https://codereview.chromium.org/1570843002 .

Patch from Pavel Labath <labath@google.com>.

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