Release frame resource in PB callback if not required. Adresses RS5-7715
Release frame resource in PB callback if not required.
Adresses RS5-7715

(cherry picked from commit e77613bd1c83561cb87c5f37370b0d2f8f72d5d2)

IntelRealSense/librealsense,IntelRealSense/librealsense,IntelRealSense/librealsense,IntelRealSense/librealsense,IntelRealSense/librealsense,IntelRealSense/librealsense,IntelRealSense/librealsense,IntelRealSense/librealsense,IntelRealSense/librealsense