unittest_compression: avoid claim_prepend

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

diff --git a/src/test/compressor/test_compression.cc b/src/test/compressor/test_compression.cc
index 913f318fc053d0bb81b100be345353a9ef05bf59..3da8592d81c957c07bd5160da83f28f04fd9ec4a 100644 (file)
--- a/src/test/compressor/test_compression.cc
+++ b/src/test/compressor/test_compression.cc
@@ -197,7 +197,8 @@ TEST_P(CompressorTest, compress_decompress)
   bufferlist prefix;
   prefix.append(string("some prefix"));
   size_t prefix_len = prefix.length();
-  out.claim_prepend(prefix);
+  prefix.claim_append(out);
+  out.swap(prefix);
   it = out.begin();
   it.advance(prefix_len);
   res = compressor->decompress(it, compressed_len, after);