bus: Check if pending messages are in the queue
bus: Check if pending messages are in the queue

We can't rely completely on the poll fd because the fd might be
created after messages were posted to the bus.

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