class.c: cancel #5620 which is no longer needed since #5622

This reverts commit d3b7601a.

src/class.c

@@ -929,13 +929,6 @@ mrb_block_given_p(mrb_state *mrb)
 MRB_API mrb_int
 mrb_get_args(mrb_state *mrb, const char *format, ...)
 {
-#define ADJUST_STACK() do { \
-  if (argv_on_stack) { \
-    ci = mrb->c->ci; \
-    argv = mrb->c->ci->stack + 1; \
-  } \
-} while (0)
-
   const char *fmt = format;
   char c;
   int i = 0;
@@ -1198,7 +1191,6 @@ mrb_get_args(mrb_state *mrb, const char *format, ...)
         p = va_arg(ap, mrb_float*);
         if (pickarg) {
           *p = mrb_as_float(mrb, *pickarg);
-          ADJUST_STACK();
         }
       }
       break;
@@ -1210,7 +1202,6 @@ mrb_get_args(mrb_state *mrb, const char *format, ...)
         p = va_arg(ap, mrb_int*);
         if (pickarg) {
           *p = mrb_as_int(mrb, *pickarg);
-          ADJUST_STACK();
         }
       }
       break;
@@ -1373,8 +1364,6 @@ mrb_get_args(mrb_state *mrb, const char *format, ...)
 finish:
   va_end(ap);
   return i;
-
-#undef ADJUST_STACK
 }
 
 static struct RClass*