dvbinfo: empty entire capture fifo on closing

If the capture thread finishes first, then empty the capture fifo
before exiting the application. The previous logic would just stop
the processing thread when the capture thread has ended. This
resulted in dvbinfo skipping the rest of the capture file and give
an incomplete result as summary.

examples/dvbinfo/dvbinfo.c

@@ -233,12 +233,21 @@ static void dvbinfo_process(dvbinfo_capture_t *capture)
         exit(EXIT_FAILURE);
     }
 
-    while (!b_error && capture->b_alive)
+    while (!b_error)
     {
+        /* Wait till fifo has emptied */
+        if (!capture->b_alive && (fifo_count(capture->fifo) == 0))
+            break;
+
         /* Wait for data to arrive */
         buffer = fifo_pop(capture->fifo);
         if (buffer == NULL)
-            break;
+        {
+            if (capture->b_alive)
+                continue;
+            else
+                break;
+        }
 
         if (param->output)
         {