video: driver: track dma buffer leak

Track dmabuf refcount during dma_buf_get() and dma_buf_put().
So if any dmabuf present with non-zero refcount during close,
then i.e a dmabuf leak. So during session close print error
and call dma_buf_put_refcount_completely() api to recursively
reduce the count to zero and will call dma_buf_put() to avoid
dmabuf leak from video driver side.

Change-Id: I2028c18ca067977eac3cdf0ce7d6cc4200739408
Signed-off-by: Govindaraj Rajagopal <grajagop@codeaurora.org>

driver/vidc/inc/msm_vidc_inst.h

@@ -131,6 +131,7 @@ struct msm_vidc_inst {
 	struct workqueue_struct           *response_workq;
 	struct list_head                   response_works; /* list of struct response_work */
 	struct list_head                   enc_input_crs;
+	struct list_head                   dmabuf_tracker; /* list of struct msm_memory_dmabuf */
 	bool                               once_per_session_set;
 	bool                               ipsc_properties_set;
 	bool                               opsc_properties_set;