staging: rtl8188eu: core: Improve cleanup code

The code is restructured such that kfree(efuseTbl) is not called
if the allocation of efuseTbl and such that kfree(eFuseWord) is not
called if the allocation of eFuseWord has failed.

To accomplish this a new label eFuseWord_failed has been added.

Suggested by: Julia Lawall <julia.lawall@lip6.fr>
Signed-off-by: Tapasweni Pathak <tapaswenipathak@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>