Smooth Streaming: fix a macro

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/stream_filter/smooth/smooth.h

@@ -162,8 +162,8 @@ struct stream_sys_t
 #define SMS_GET_SELECTED_ST( cat ) \
     sms_get_stream_by_cat( p_sys->selected_st, cat )
 
-#define NO_MORE_CHUNKS !p_sys->b_live && \
-    no_more_chunks( p_sys->download.ck_index, p_sys->selected_st )
+#define NO_MORE_CHUNKS ( !p_sys->b_live && \
+    no_more_chunks( p_sys->download.ck_index, p_sys->selected_st ) )
 
 sms_queue_t *sms_queue_init( const int );
 int sms_queue_put( sms_queue_t *, const uint64_t );