Add some missing nullable annotations
Part-of: <!699>
- gst/gstbufferpool.c 11 additions, 11 deletionsgst/gstbufferpool.c
- gst/gstdatetime.c 9 additions, 9 deletionsgst/gstdatetime.c
- gst/gstdeviceprovider.c 1 addition, 1 deletiongst/gstdeviceprovider.c
- gst/gstelement.c 1 addition, 1 deletiongst/gstelement.c
- gst/gstparse.c 4 additions, 4 deletionsgst/gstparse.c
- gst/gstplugin.c 1 addition, 1 deletiongst/gstplugin.c
- gst/gstregistry.c 1 addition, 1 deletiongst/gstregistry.c
- gst/gststreamcollection.c 1 addition, 1 deletiongst/gststreamcollection.c
- gst/gsttypefind.c 3 additions, 3 deletionsgst/gsttypefind.c
- gst/gsttypefindfactory.c 1 addition, 1 deletiongst/gsttypefindfactory.c
- gst/gsturi.c 1 addition, 1 deletiongst/gsturi.c
- gst/gstutils.c 2 additions, 2 deletionsgst/gstutils.c
- libs/gst/base/gstaggregator.c 6 additions, 6 deletionslibs/gst/base/gstaggregator.c
- libs/gst/base/gstbasesrc.c 3 additions, 4 deletionslibs/gst/base/gstbasesrc.c
- libs/gst/base/gstbasetransform.c 3 additions, 4 deletionslibs/gst/base/gstbasetransform.c