There is no need to use DRM dumb pool if buffer to render is already a DMABuf, just import it and render it.
This fixes a DMAbuf memory leakage when waylandsink downstream element exports DMABuf while waylandsink is configured to be DMABuf exporter (drm-device=/drv/dri/card0):
gst-launch-1.0 v4l2src io-mode=4 ! waylandsink drm-device=/dev/dri/card0
leakage identfied with command:
watch "cat /sys/kernel/debug/dma_buf/bufinfo | grep attached "
Fixes #2729 (closed)