[Bug 264472] ib_sysfs: use the correct unregister function

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264472

            Bug ID: 264472
           Summary: ib_sysfs: use the correct unregister function
           Product: Base System
           Version: Unspecified
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: ruc_gongyuanjun@163.com

Created attachment 234461
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=234461&action=edit
a possible patch

In ib_device_register_sysfs, on the error path, device_unregister
is called. device_register deletes the device, which will cause use
after free. device_del should be called which undose device_add but
not delete the device.

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