lavfi: fix signature for avfilter_graph_parse() and avfilter_graph_config()

Require "void *" rather than "AVClass *" for the log context type.

libavfilter/avfilter.h

@@ -27,7 +27,7 @@
 
 #define LIBAVFILTER_VERSION_MAJOR  2
 #define LIBAVFILTER_VERSION_MINOR 15
-#define LIBAVFILTER_VERSION_MICRO  0
+#define LIBAVFILTER_VERSION_MICRO  1
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
                                                LIBAVFILTER_VERSION_MINOR, \

libavfilter/avfiltergraph.c

@@ -229,7 +229,7 @@ int ff_avfilter_graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
     return 0;
 }
 
-int avfilter_graph_config(AVFilterGraph *graphctx, AVClass *log_ctx)
+int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
 {
     int ret;
 

libavfilter/avfiltergraph.h

@@ -76,7 +76,7 @@ int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,
  * @param log_ctx context used for logging
  * @return 0 in case of success, a negative AVERROR code otherwise
  */
-int avfilter_graph_config(AVFilterGraph *graphctx, AVClass *log_ctx);
+int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx);
 
 /**
  * Free a graph, destroy its links, and set *graph to NULL.
@@ -118,6 +118,6 @@ typedef struct AVFilterInOut {
  */
 int avfilter_graph_parse(AVFilterGraph *graph, const char *filters,
                          AVFilterInOut *inputs, AVFilterInOut *outputs,
-                         AVClass *log_ctx);
+                         void *log_ctx);
 
 #endif /* AVFILTER_AVFILTERGRAPH_H */

libavfilter/graphparser.c

@@ -329,7 +329,7 @@ static int parse_outputs(const char **buf, AVFilterInOut **curr_inputs,
 
 int avfilter_graph_parse(AVFilterGraph *graph, const char *filters,
                          AVFilterInOut *open_inputs,
-                         AVFilterInOut *open_outputs, AVClass *log_ctx)
+                         AVFilterInOut *open_outputs, void *log_ctx)
 {
     int index = 0, ret;
     char chr = 0;