unittest_striper: fix warning

In file included from test/test_striper.cc:1:0:
../src/gtest/include/gtest/gtest.h: In function ‘testing::AssertionResult testing::internal::CmpHelperEQ(const char*, const char*, const T1&, const T2&) [with T1 = int, T2 = unsigned int]’:
../src/gtest/include/gtest/gtest.h:1300:30: instantiated from ‘static testing::AssertionResult testing::internal::EqHelper::Compare(const char*, const char*, const T1&, const T2&) [with T1 = int, T2 = unsigned int, bool lhs_is_null_literal = false]’
test/test_striper.cc:57:223: instantiated from here
warning: ../src/gtest/include/gtest/gtest.h:1263:3: comparison between signed and unsigned integer expressions [-Wsign-compare]

Signed-off-by: Sage Weil <sage@inktank.com>