Fix early free of irep->filename

src/codegen.c

@@ -2403,6 +2403,8 @@ scope_finish(codegen_scope *s)
 {
   mrb_state *mrb = s->mrb;
   mrb_irep *irep = s->irep;
+  size_t fname_len;
+  char *fname;
 
   irep->flags = 0;
   if (s->iseq) {
@@ -2418,7 +2420,11 @@ scope_finish(codegen_scope *s)
   irep->pool = (mrb_value *)codegen_realloc(s, irep->pool, sizeof(mrb_value)*irep->plen);
   irep->syms = (mrb_sym *)codegen_realloc(s, irep->syms, sizeof(mrb_sym)*irep->slen);
   if (s->filename) {
-    irep->filename = s->filename;
+    fname_len = strlen(s->filename);
+    fname = codegen_malloc(s, fname_len + 1);
+    memcpy(fname, s->filename, fname_len);
+    fname[fname_len + 1] = '\0';
+    irep->filename = fname;
   }
 
   irep->nlocals = s->nlocals;

src/load.c

@@ -267,9 +267,6 @@ read_rite_lineno_record(mrb_state *mrb, const uint8_t *bin, size_t irepno, uint3
   mrb->irep[irepno]->lines = lines;
 
 error_exit:
-  if (fname) {
-    mrb_free(mrb, fname);
-  }
 
   return ret;
 }

src/state.c

@@ -101,6 +101,7 @@ mrb_irep_free(mrb_state *mrb, struct mrb_irep *irep)
     mrb_free(mrb, irep->iseq);
   mrb_free(mrb, irep->pool);
   mrb_free(mrb, irep->syms);
+  mrb_free(mrb, (void *)irep->filename);
   mrb_free(mrb, irep->lines);
   mrb_free(mrb, irep);
 }