rgw: fix compile warning

rgw: fix compile warning

/git/ceph/src/rgw/rgw_rest_swift.cc: In member function ‘virtual void RGWListBucket_ObjStore_SWIFT::send_response()’:
/git/ceph/src/rgw/rgw_rest_swift.cc:319:7: warning: this ‘if’ clause does not guard... [-Wmisleading-indentation]
       if (name.compare(delimiter) == 0)
       ^~
/git/ceph/src/rgw/rgw_rest_swift.cc:322:9: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘if’
         s->formatter->open_object_section_with_attrs("subdir", FormatterAttrs("name", name.c_str(), NULL));
         ^

Signed-off-by: Wanlong Gao <wanlong.gao@easystack.cn>