staging: comedi: jr3_pci: return 'result' from comedi_pci_enable instead of -EIO

Fix a smatch warning:
drivers/staging/comedi/drivers/jr3_pci.c:793 jr3_pci_auto_attach() info: why not propagate 'result' from comedi_pci_enable() instead of -5?

CC: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>