fix issue with null pointer cast use brackets around macro arguments
fix issue with null pointer cast use brackets around macro arguments

Original commit message from CVS:
fix issue with null pointer cast
use brackets around macro arguments

Lachann/gstreamer,centricular/gstreamer,magcius/gstreamer,mparis/gstreamer,centricular/gstreamer,krichter722/gstreamer,krichter722/gstreamer,collects/gstreamer,StreamUtils/gstreamer,ahmedammar/platform_external_gst_gstreamer,ahmedammar/platform_external_gst_gstreamer,ylatuya/gstreamer,lubosz/gstreamer,drothlis/gstreamer,cfoch/gstreamer,drothlis/gstreamer,ahmedammar/platform_external_gst_gstreamer,cablelabs/gstreamer,Distrotech/gstreamer,shelsonjava/gstreamer,jpxiong/gstreamer,cablelabs/gstreamer,drothlis/gstreamer,justinjoy/gstreamer,ylatuya/gstreamer,krieger-od/gstreamer,shelsonjava/gstreamer,magcius/gstreamer,justinjoy/gstreamer,collects/gstreamer,lubosz/gstreamer,justinjoy/gstreamer,lovebug356/gstreamer,Lachann/gstreamer,ahmedammar/platform_external_gst_gstreamer,mparis/gstreamer,magcius/gstreamer,ensonic/gstreamer,lubosz/gstreamer,jpakkane/gstreamer,surround-io/gstreamer,mparis/gstreamer,cfoch/gstreamer,StreamUtils/gstreamer,ylatuya/gstreamer,Lachann/gstreamer,mrchapp/gstreamer,lubosz/gstreamer,justinjoy/gstreamer,ensonic/gstreamer,collects/gstreamer,mparis/gstreamer,centricular/gstreamer,centricular/gstreamer,shelsonjava/gstreamer,StreamUtils/gstreamer,lubosz/gstreamer,drothlis/gstreamer,jpxiong/gstreamer,jpxiong/gstreamer,ensonic/gstreamer,krichter722/gstreamer,drothlis/gstreamer,lovebug356/gstreamer,ahmedammar/platform_external_gst_gstreamer,cablelabs/gstreamer,jpakkane/gstreamer,Distrotech/gstreamer,collects/gstreamer,Lachann/gstreamer,surround-io/gstreamer,mrchapp/gstreamer,ylatuya/gstreamer,krieger-od/gstreamer,collects/gstreamer,krieger-od/gstreamer,surround-io/gstreamer,cablelabs/gstreamer,cablelabs/gstreamer,jpxiong/gstreamer,Distrotech/gstreamer,krichter722/gstreamer,shelsonjava/gstreamer,krieger-od/gstreamer,surround-io/gstreamer,mparis/gstreamer,ylatuya/gstreamer,jpakkane/gstreamer,magcius/gstreamer,StreamUtils/gstreamer,cfoch/gstreamer,mrchapp/gstreamer,shelsonjava/gstreamer,ensonic/gstreamer,cfoch/gstreamer,jpakkane/gstreamer,Distrotech/gstreamer,lovebug356/gstreamer,krichter722/gstreamer,Distrotech/gstreamer,jpxiong/gstreamer,cfoch/gstreamer,mrchapp/gstreamer,jpakkane/gstreamer,magcius/gstreamer,Lachann/gstreamer,justinjoy/gstreamer,ensonic/gstreamer,mrchapp/gstreamer,surround-io/gstreamer,lovebug356/gstreamer,StreamUtils/gstreamer,krieger-od/gstreamer,lovebug356/gstreamer,centricular/gstreamer