extmod/vfs_lfs: Fix bug when passing no args to constructor and mkfs.

extmod/vfs_lfs.c

@@ -33,7 +33,7 @@
 enum { LFS_MAKE_ARG_bdev, LFS_MAKE_ARG_readsize, LFS_MAKE_ARG_progsize, LFS_MAKE_ARG_lookahead };
 
 static const mp_arg_t lfs_make_allowed_args[] = {
-    { MP_QSTR_, MP_ARG_OBJ },
+    { MP_QSTR_, MP_ARG_REQUIRED | MP_ARG_OBJ },
     { MP_QSTR_readsize, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 32} },
     { MP_QSTR_progsize, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 32} },
     { MP_QSTR_lookahead, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 32} },