#565 wcstof() segfaults if endPtr is NULL

[Torsten Paul]

Example:

include <stdio.h></stdio.h>

include <windows.h></windows.h>

int main() {
float f = wcstof(L"2.34", nullptr);
printf("%.2f\n", f);
return 0;
}

[niXman]

done: https://sourceforge.net/p/mingw-w64/mingw-w64/ci/051971a34bf187e202843df485c1106abd44b3dc/