change NULL to (NULL) for GST_ELEMENT_ERROR

Original commit message from CVS:
change NULL to (NULL) for GST_ELEMENT_ERROR
Make sure errors end with "."

common @ 508678c1

-Subproject commit 5da247bb6f217c5c32e5ebab0d3a2014dfa452c3
+Subproject commit 508678c12ea745e207eb8bb3be12c156e3bb698c

ext/ffmpeg/gstffmpegdec.c

@@ -324,7 +324,7 @@ gst_ffmpegdec_chain (GstPad    *pad,
   gint have_data;
 
   if (!ffmpegdec->opened) {
-    GST_ELEMENT_ERROR (ffmpegdec, CORE, NEGOTIATION, NULL,
+    GST_ELEMENT_ERROR (ffmpegdec, CORE, NEGOTIATION, (NULL),
 		       ("ffdec_%s: input format was not set before data start",
 		       oclass->in_plugin->name));
     return;
@@ -414,7 +414,7 @@ gst_ffmpegdec_chain (GstPad    *pad,
 					     ffmpegdec->context);
         if (caps == NULL ||
             !gst_pad_set_explicit_caps (ffmpegdec->srcpad, caps)) {
-          GST_ELEMENT_ERROR (ffmpegdec, CORE, NEGOTIATION, NULL,
+          GST_ELEMENT_ERROR (ffmpegdec, CORE, NEGOTIATION, (NULL),
 			     ("Failed to link ffmpeg decoder (%s) to next element",
 			     oclass->in_plugin->name));
           return;

ext/ffmpeg/gstffmpegdemux.c

@@ -241,7 +241,7 @@ gst_ffmpegdemux_loop (GstElement *element)
 					       ffmpegdemux->sinkpad),
 			      oclass->in_plugin, 0, NULL);
     if (res < 0) {
-      GST_ELEMENT_ERROR (ffmpegdemux, LIBRARY, TOO_LAZY, NULL,
+      GST_ELEMENT_ERROR (ffmpegdemux, LIBRARY, TOO_LAZY, (NULL),
 			 ("Failed to open demuxer/file context"));
       return;
     }

ext/ffmpeg/gstffmpegmux.c

@@ -330,7 +330,7 @@ gst_ffmpegmux_loop (GstElement *element)
     if (url_fopen (&ffmpegmux->context->pb,
 		   ffmpegmux->context->filename,
 		   URL_WRONLY) < 0) {
-      GST_ELEMENT_ERROR (element, LIBRARY, TOO_LAZY, NULL,
+      GST_ELEMENT_ERROR (element, LIBRARY, TOO_LAZY, (NULL),
 			 ("Failed to open stream context in ffmux"));
       return;
     }