Skip array embedding if `MRB_NO_BOXING` and `MRB_32BIT`; fix #4382

On some platforms, `sizeof(mrb_value) > sizeof(void*)*3`, which makes
`MRB_ARY_EMBED_LEN_MAX` zero. And zero sized array cause compile errors.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/vm.c b/src/vm.c
index 82301aaf4..87606c1b4 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -1823,7 +1823,7 @@ RETRY_TRY_BLOCK:
         if (kd) regs[len + 1] = kdict;
 
         /* copy mandatory and optional arguments */
-        if (argv0 != argv) {
+        if (argv0 != argv && argv) {
           value_move(&regs[1], argv, argc-mlen); /* m1 + o */
         }
         if (argc < m1) {