test: fix unused assert's variable in ceph_test_osd_stale_read.cc

This rectifies:
```
ceph_test_osd_stale_read.cc:39:7: warning: unused variable ‘r’ [-Wunused-variable]
   int r = rados.mon_command(cmd, inbl, &outbl, NULL);
```

Signed-off-by: Radoslaw Zarzynski <rzarzyns@redhat.com>

diff --git a/src/test/osd/ceph_test_osd_stale_read.cc b/src/test/osd/ceph_test_osd_stale_read.cc
index dc4b63a32f69fa21a11cc8c224d34d96699a2ad8..41b5aa6d348f041cfabc572bf2058ad13a2214fd 100644 (file)
--- a/src/test/osd/ceph_test_osd_stale_read.cc
+++ b/src/test/osd/ceph_test_osd_stale_read.cc
@@ -36,8 +36,10 @@ int get_primary_osd(Rados& rados, const string& pool_name,
     + oid
     + string("\",\"format\": \"json\"}");
   bufferlist outbl;
-  int r = rados.mon_command(cmd, inbl, &outbl, NULL);
-  assert(r >= 0);
+  if (int r = rados.mon_command(cmd, inbl, &outbl, nullptr);
+      r < 0) {
+    return r;
+  }
   string outstr(outbl.c_str(), outbl.length());
   json_spirit::Value v;
   if (!json_spirit::read(outstr, v)) {