test_librbd: remove unsigned/signed comparison

Signed-off-by: Greg Farnum <gregory.farnum@dreamhost.com>

diff --git a/src/test/test_librbd.cc b/src/test/test_librbd.cc
index 53d7d3cac8e61c77034db401cd87ca88cccf1c32..42b300197b6f8bd972b1e723dd1efbcfc4790bbc 100644 (file)
--- a/src/test/test_librbd.cc
+++ b/src/test/test_librbd.cc
@@ -670,7 +670,7 @@ void aio_write_test_data(librbd::Image& image, const char *test_data, off_t off)
 
 void write_test_data(librbd::Image& image, const char *test_data, off_t off)
 {
-  int written;
+  size_t written;
   size_t len = strlen(test_data);
   ceph::bufferlist bl;
   bl.append(test_data, len);