librbd: use initialized data for DiffIterateDiscard test

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

diff --git a/src/test/librbd/test_librbd.cc b/src/test/librbd/test_librbd.cc
index 8743e5aa5210a34479875a8deb22bd44ce6fe83c..0094d6504403bf7a1dcf49934a4135d7d57d8e88 100644 (file)
--- a/src/test/librbd/test_librbd.cc
+++ b/src/test/librbd/test_librbd.cc
@@ -1653,6 +1653,7 @@ TEST(LibRBD, DiffIterateDiscard)
     ASSERT_EQ(0u, extents.size());
 
     char data[256];
+    memset(data, 1, sizeof(data));
     bl.append(data, 256);
     ASSERT_EQ(256, image.write(0, 256, bl));
     ASSERT_EQ(0, image.diff_iterate(NULL, 0, size,