iflib: remove kobject class reference increment

[jacob.e.keller_intel.com]

Summary

In iflib_register, the context is initialized as a kobject using the
device driver's "driver" kobject class. As part of this, the function
mistakenly increments the ref counter.

The ref counter is incremented twice, once in the code directly, and
once again by kobj_class_compile. However, there is no associated
decrement in the detach path. Because of this, the ref counter will
never go back down to zero, and thus the kobject method table will never
be released.

Remove this unnecessary reference count increment.

Signed-off-by: Jacob Keller <[e-mail]>