Fixed problem where ts.c 'read' content beyond EOF

If the source stream went empty when we tried to refil then we failed
to notice the EOF and read beyond the end of the buffer

ts.c

@@ -1384,6 +1384,9 @@ static int read_next_TS_packets(TS_reader_p  tsreader,
   ssize_t length;
 #endif
 
+  // If we exit with an error make sure we don't return anything valid here!
+  *packet = NULL;
+
   if (tsreader->read_ahead_ptr == tsreader->read_ahead_end)
   {
     // Try to allow for partial reads
@@ -1738,6 +1741,9 @@ extern int read_next_TS_packet_from_buffer(TS_reader_p  tsreader,
         // so our second best choice is to "play out" using the last
         // known PCR rate-of-change.
         tsreader->pcrbuf->TS_had_EOF = TRUE;              // remember we're playing out
+        // If we read nothing we must die now
+        if (tsreader->pcrbuf->TS_buffer_next == tsreader->pcrbuf->TS_buffer_len)
+          return err;
       }
       else if (err)
         return err;