Fix autotest-deps-glbench gcc-4.7 building problem.

Added explicit converion in initialization list.

TEST=built with gcc-4.7
BUG=None

Change-Id: I6b3ebd4cdef949ed29a5add8e9dbdcf3757791b9
Reviewed-on: https://gerrit.chromium.org/gerrit/25686
Reviewed-by: Yunlian Jiang <yunlian@chromium.org>
Tested-by: Han Shen <shenhan@chromium.org>
Commit-Ready: Han Shen <shenhan@chromium.org>
1 file changed