fixed double free - fixed probe function

Originally committed as revision 592 to svn://svn.ffmpeg.org/ffmpeg/trunk

libav/swf.c

 /*
  * Flash Compatible Streaming Format
- * Copyright (c) 2000 Gerard Lantau.
+ * Copyright (c) 2000 Fabrice Bellard.
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
  *
- * This program is distributed in the hope that it will be useful,
+ * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
  *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 #include "avformat.h"
 
@@ -414,7 +414,6 @@ static int swf_write_trailer(AVFormatContext *s)
         url_fseek(pb, swf->duration_pos, SEEK_SET);
         put_le16(pb, video_enc->frame_number);
     }
-    av_free(swf);
     return 0;
 }
 
@@ -445,7 +444,7 @@ static int swf_probe(AVProbeData *p)
     if (p->buf_size <= 16)
         return 0;
     if (p->buf[0] == 'F' && p->buf[1] == 'W' &&
-        p->buf[2] == 'S' && p->buf[3] == '\0')
+        p->buf[2] == 'S')
         return AVPROBE_SCORE_MAX;
     else
         return 0;