ixgbe: remove redundant check on ret_val

The last check on ret_val is redundant since ret_val has not changed
since the previous check, so remove it as it is extraneous.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>