jscript: Reorganize StringConstr_value slightly to avoid confusing gcc.

dlls/jscript/string.c

@@ -1645,26 +1645,21 @@ static HRESULT StringConstr_value(script_ctx_t *ctx, vdisp_t *jsthis, WORD flags
         break;
     }
     case DISPATCH_CONSTRUCT: {
+        jsstr_t *str;
         jsdisp_t *ret;
 
         if(argc) {
-            jsstr_t *str;
-
             hres = to_string(ctx, argv[0], &str);
             if(FAILED(hres))
                 return hres;
-
-            hres = create_string(ctx, str, &ret);
-            jsstr_release(str);
         }else {
-            hres = create_string(ctx, jsstr_empty(), &ret);
+            str = jsstr_empty();
         }
 
-        if(FAILED(hres))
-            return hres;
-
-        *r = jsval_obj(ret);
-        break;
+        hres = create_string(ctx, str, &ret);
+        if (SUCCEEDED(hres)) *r = jsval_obj(ret);
+        jsstr_release(str);
+        return hres;
     }
 
     default: