test/librbd: treat empty features environment variable as old format

Signed-off-by: Jason Dillaman <dillaman@redhat.com>

diff --git a/src/test/librbd/test_librbd.cc b/src/test/librbd/test_librbd.cc
index 7d019b4333f411f0f988149dd187c4e15cd463a6..f9dd645a9427fad1382a5ee54b8239c303b88a8c 100644 (file)
--- a/src/test/librbd/test_librbd.cc
+++ b/src/test/librbd/test_librbd.cc
@@ -70,7 +70,7 @@ void register_test_librbd() {
 static int get_features(bool *old_format, uint64_t *features)
 {
   const char *c = getenv("RBD_FEATURES");
-  if (c) {
+  if (c && strlen(c) > 0) {
     stringstream ss;
     ss << c;
     ss >> *features;