test_librbd.cc: fix compiler warning

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>

diff --git a/src/test/librbd/test_librbd.cc b/src/test/librbd/test_librbd.cc
index ce3df136cb774e5455e92155e464e72f8a93b163..6a61f3fe3a48c2902c3c706deb7c26bac1515e22 100644 (file)
--- a/src/test/librbd/test_librbd.cc
+++ b/src/test/librbd/test_librbd.cc
@@ -1819,7 +1819,7 @@ TEST(LibRBD, DiffIterateRegression6926)
     extents.clear();
     ASSERT_EQ(0, image.diff_iterate(NULL, 0, size,
                                    vector_iterate_cb, (void *) &extents));
-    ASSERT_EQ(0, extents.size());
+    ASSERT_EQ(static_cast<size_t>(0), extents.size());
   }
   ioctx.close();
   ASSERT_EQ(0, destroy_one_pool_pp(pool_name, rados));