Fix assert

bd/lfs_testbd.c

diff --git a/bd/lfs_testbd.c b/bd/lfs_testbd.c
index 1ec6fb9..9d3f40c 100644
--- a/bd/lfs_testbd.c
+++ b/bd/lfs_testbd.c
@@ -207,7 +207,7 @@
         bd->power_cycles -= 1;
         if (bd->power_cycles == 0) {
             // sync to make sure we persist the last changes
-            assert(lfs_testbd_rawsync(cfg) == 0);
+            LFS_ASSERT(lfs_testbd_rawsync(cfg) == 0);
             // simulate power loss
             exit(33);
         }
@@ -254,7 +254,7 @@
         bd->power_cycles -= 1;
         if (bd->power_cycles == 0) {
             // sync to make sure we persist the last changes
-            assert(lfs_testbd_rawsync(cfg) == 0);
+            LFS_ASSERT(lfs_testbd_rawsync(cfg) == 0);
             // simulate power loss
             exit(33);
         }