correct lenght calculation for SE

src/encode.c

@@ -443,7 +443,7 @@ static uint32_t assess_se_option(struct aec_stream *strm)
             len = UINT32_MAX;
             break;
         } else {
-            len += d * (d + 1) / 2 + state->block[i + 1];
+            len += d * (d + 1) / 2 + state->block[i + 1] + 1;
         }
     }
     return len;

tests/check_code_options.c

@@ -138,9 +138,9 @@ int check_se(struct test_state *state)
         state->out(tmp + size, 0, size);
         state->out(tmp + 2 * size, 0, size);
         state->out(tmp + 3 * size, 0, size);
-        state->out(tmp + 4 * size, 0, size);
-        state->out(tmp + 5 * size, 0, size);
-        state->out(tmp + 6 * size, 0, size);
+        state->out(tmp + 4 * size, 1, size);
+        state->out(tmp + 5 * size, 1, size);
+        state->out(tmp + 6 * size, 1, size);
         state->out(tmp + 7 * size, 1, size);
     }