codegen.c: adjust indentation after `OP_STRCAT`.
@@ -503,7 +503,7 @@ codedump(mrb_state *mrb, const mrb_irep *irep)
print_lv_a(mrb, irep, a);
break;
CASE(OP_STRCAT, B):
- printf("STRCAT\tR%d\tR%d", a, a+1);
+ printf("STRCAT\tR%d\tR%d\t", a, a+1);
print_lv_a(mrb, irep, a);
break;
CASE(OP_HASH, BB):
