Merge remote-tracking branch 'qatar/master'

* qatar/master:
  swscale: fix NULL checking in sws_alloc_context()
  mxfdec: fix NULL checking in mxf_get_sorted_table_segments()
  finalize changelog for version 9

Conflicts:
	Changelog
	libavformat/mxfdec.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

libswscale/utils.c

@@ -888,8 +888,10 @@ SwsContext *sws_alloc_context(void)
 {
     SwsContext *c = av_mallocz(sizeof(SwsContext));
 
-    c->av_class = &sws_context_class;
-    av_opt_set_defaults(c);
+    if (c) {
+        c->av_class = &sws_context_class;
+        av_opt_set_defaults(c);
+    }
 
     return c;
 }