Remove unused static variable to fix build error

Remove unused static variable to fix build error

 [Problem] After update tool chain to GCC6, 'definded but not used' build error happen

Before GCC6 -Wunused-variable (enabled by -Wall) didn’t warn for unused static const variables in C.
This was because some old code had constructs like: static const char rcs_id[] = "$Id:...";.
But this old special use case is not very common anymore. And not warning about such unused variables was hiding real bugs.
So GCC6 introduces -Wunused-const-variable (enabled by -Wunused-variable for C, but not for C++).

Change-Id: I075937a718b0dbbd3cab28df75084581bed363ab
Signed-off-by: jiyong.min <jiyong.min@samsung.com>