common/str_list: remove unused "using"

Signed-off-by: Kefu Chai <kchai@redhat.com>

diff --git a/src/common/str_list.cc b/src/common/str_list.cc
index 016155e98b7332262a30183f816802d1f042dc29..e2284e1e19989de7df88ea0aaf7887d6dba89ce3 100644 (file)
--- a/src/common/str_list.cc
+++ b/src/common/str_list.cc
@@ -16,7 +16,6 @@
 
 using std::string;
 using std::vector;
-using std::set;
 using std::list;
 using ceph::for_each_substr;