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In hypervisor, all the parameter and return value printf related are unsigned int, this patch is used to fix the function definitions. v1->v2: *Modify the return value of various functions, such as printf(), vprintf(), charout(), do_printf(), charmem, print_pow2(), print_decimal to void due to never used, no necessary to use, or has already returned by param. *Delete the impossible judgement of param->emit due to the type is unsigned. Tracked-On: #861 Signed-off-by: Junjun Shan <junjun.shan@intel.com> Acked-by: Eddie Dong <eddie.dong@intel.com>