lavc/bitstream_filter: do not crash in case the argument of av_bitstream_filter_close() is NULL

libavcodec/bitstream_filter.c

@@ -53,6 +53,8 @@ AVBitStreamFilterContext *av_bitstream_filter_init(const char *name){
 }
 
 void av_bitstream_filter_close(AVBitStreamFilterContext *bsfc){
+    if (!bsfc)
+        return;
     if(bsfc->filter->close)
         bsfc->filter->close(bsfc);
     av_freep(&bsfc->priv_data);

libavcodec/version.h

@@ -30,7 +30,7 @@
 
 #define LIBAVCODEC_VERSION_MAJOR 55
 #define LIBAVCODEC_VERSION_MINOR  18
-#define LIBAVCODEC_VERSION_MICRO 100
+#define LIBAVCODEC_VERSION_MICRO 101
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
                                                LIBAVCODEC_VERSION_MINOR, \