core/cgroup: block_get_originating() doesn't return > 0

Follow-up for 612fc70fc0f5445817f3f5c033dd3d5b5fd058ea

diff --git a/src/core/cgroup.c b/src/core/cgroup.c
index 74c9d786a1f230b02aa29d4b7f482607162499b3..e37bf46e876f1dfd25a05f00bc5e3d851b61d308 100644 (file)
--- a/src/core/cgroup.c
+++ b/src/core/cgroup.c
@@ -1019,7 +1019,8 @@ static int lookup_block_device(const char *p, dev_t *ret) {
         }
 
         /* If this is a LUKS/DM device, recursively try to get the originating block device */
-        while (block_get_originating(*ret, ret) > 0);
+        while (block_get_originating(*ret, ret) >= 0)
+                ;
 
         /* If this is a partition, try to get the originating block device */
         (void) block_get_whole_disk(*ret, ret);