initialization of defined variables

Because in functions of hardware.c, the variables are
not initialized when they are defined, valgrind indicates
that these variables are used as uninitialised! So,
the purpose of this patch is initialization of varaibles.
In the same way, the patch fixes the compilation warning
(unused variable).

Change-Id: Ibaab89d7b57eb9e3a1f46c3af61705a39be10e16
Signed-off-by: Andrei V. FOMITCHEV <andreix.fomitchev@intel.com>
Signed-off-by: Jin Wei <wei.a.jin@intel.com>