test: silence warning from -Wsign-compare

[joscollin]

Fixed warnings:

In file included from ceph/src/test/test_xlist.cc:6:0:
ceph/src/googletest/googletest/include/gtest/gtest.h: In instantiation of ‘testing::AssertionResult testing::internal::CmpHelperEQ(const char*, const char*, const T1&, const T2&) [with T1 = long unsigned int; T2 = int]’:
ceph/src/googletest/googletest/include/gtest/gtest.h:1421:23:   required from ‘static testing::AssertionResult testing::internal::EqHelper<lhs_is_null_literal>::Compare(const char*, const char*, const T1&, const T2&) [with T1 = long unsigned int; T2 = int; bool lhs_is_null_literal = false]’
ceph/src/test/test_xlist.cc:46:3:   required from here
ceph/src/googletest/googletest/include/gtest/gtest.h:1392:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if (lhs == rhs) {
       ~~~~^~~~~~

In file included from ceph/src/test/librados/tier.cc:3:0:
ceph/src/googletest/googletest/include/gtest/gtest.h: In instantiation of ‘testing::AssertionResult testing::internal::CmpHelperLT(const char*, const char*, const T1&, const T2&) [with T1 = int; T2 = long unsigned int]’:
ceph/src/test/librados/tier.cc:1360:5:   required from here
ceph/src/googletest/googletest/include/gtest/gtest.h:1526:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
ceph/src/googletest/googletest/include/gtest/gtest.h:1510:7:
   if (val1 op val2) {\
       ~~~~~~~~~             
ceph/src/googletest/googletest/include/gtest/gtest.h:1526:28:
 GTEST_IMPL_CMP_HELPER_(LT, <);
ceph/src/googletest/googletest/include/gtest/gtest.h:1510:12: note: in definition of macro ‘GTEST_IMPL_CMP_HELPER_’
   if (val1 op val2) {\
            ^~

In file included from ceph/src/test/librados/tier.cc:3:0:
ceph/src/googletest/googletest/include/gtest/gtest.h: In instantiation of ‘testing::AssertionResult testing::internal::CmpHelperLT(const char*, const char*, const T1&, const T2&) [with T1 = int; T2 = long unsigned int]’:
ceph/src/test/librados/tier.cc:1365:2:   required from here
ceph/src/googletest/googletest/include/gtest/gtest.h:1526:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
ceph/src/googletest/googletest/include/gtest/gtest.h:1510:7:
   if (val1 op val2) {\
       ~~~~~~~~~             
ceph/src/googletest/googletest/include/gtest/gtest.h:1526:28:
 GTEST_IMPL_CMP_HELPER_(LT, <);
ceph/src/googletest/googletest/include/gtest/gtest.h:1510:12: note: in definition of macro ‘GTEST_IMPL_CMP_HELPER_’
   if (val1 op val2) {\

Signed-off-by: Jos Collin jcollin@redhat.com

[liewegas]

http://pulpito.ceph.com/sage-2017-09-25_12:59:41-rados-wip-sage-testing2-2017-09-24-2223-distro-basic-smithi/