Currently in function vhost_user_msg_handler, variable ret is used to
store both vhost msg result code and function call return value.
After this patch, variable ret is used only to store function call
return value, a new dedicated variable msg_result is used to
store vhost msg result. This can improve readability.
Signed-off-by: Andy Pei <andy.pei@intel.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>
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