Reset nb_no_activity_frames when analysis DTX isn't used
diff --git a/src/opus_encoder.c b/src/opus_encoder.c
index ab08bff..ab9e3e8 100644
--- a/src/opus_encoder.c
+++ b/src/opus_encoder.c
@@ -2150,6 +2150,8 @@
           RESTORE_STACK;
           return 1;
        }
+    } else {
+       st->nb_no_activity_frames = 0;
     }
 #endif