Remove an unnecessary boolean interim variable

This is needless because it is only used once, right after the creation.
Moreover, we would probably need to separate the two calls later into distinct
introspection conditions to give a bit more correct warning whether the sysfs is
present, or it is just not readable for some reason.

It is also consistent with some other places.

It also eliminates the needless indentation level for that relatively long
block.

Change-Id: Ib66e3033c2439315a8034101129cadd2dcdc29d0
Reviewed-by: Sergey Belyashov <Sergey.Belyashov@gmail.com>
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>