idpf: update idpf_up_complete() return type to void

idpf: update idpf_up_complete() return type to void

idpf_up_complete() function always returns 0 and no callers use this return
value. Although idpf_vport_open() checks the return value, it only handles
error cases which never occur. Change the return type to void to simplify
the code.

Signed-off-by: Sreedevi Joshi <sreedevi.joshi@intel.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>