shared/machine-pool: fix mkfs.btrfs checking

binary_is_good translates ENOENT to 0
See https://github.com/systemd/systemd/commit/85eca92e#diff-bcad68c477b6651521e880c40b7a9b40R813

diff --git a/src/shared/machine-pool.c b/src/shared/machine-pool.c
index f080b84..e0bad03 100644 (file)
--- a/src/shared/machine-pool.c
+++ b/src/shared/machine-pool.c
@@ -239,10 +239,8 @@ int setup_machine_directory(uint64_t size, sd_bus_error *error) {
         }
 
         r = mkfs_exists("btrfs");
-        if (r == -ENOENT) {
-                log_debug("mkfs.btrfs is missing, cannot create loopback file for /var/lib/machines.");
-                return 0;
-        }
+        if (r == 0)
+                return sd_bus_error_set_errnof(error, ENOENT, "Cannot set up /var/lib/machines, mkfs.btrfs is missing");
         if (r < 0)
                 return r;