nodedev: Fix sysfs paths for vport operations
Some kernels, such as the one used in RHEL-5, have vport_create and vport_delete operation files in /sys/class/scsi_host/hostN directory instead of /sys/class/fc_host/hostN. Let's check both paths for compatibility reasons. This also removes unnecessary '/' characters from sysfs paths containing LINUX_SYSFS_FC_HOST_PREFIX.
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