i40e: use ERR_PTR error print in i40e messages

In i40e_status removal patches, i40e_status conversion
to strings was removed in order to easily refactor
the code to use standard errornums. This however made it
more difficult for read error logs.

Use %pe formatter to print error messages in human-readable
format.

Signed-off-by: Jan Sokolowski <jan.sokolowski@intel.com>
Tested-by: Gurucharan G <gurucharanx.g@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>