media: venus: vdec: fixed possible memory leak issue

The venus_helper_alloc_dpb_bufs() implementation allows an early return
on an error path when checking the id from ida_alloc_min() which would
not release the earlier buffer allocation.

Move the direct kfree() from the error checking of dma_alloc_attrs() to
the common fail path to ensure that allocations are released on all
error paths in this function.

Addresses-Coverity: 1494120 ("Resource leak")

cc: stable@vger.kernel.org # 5.16+
Fixes: 40d87aaf ("media: venus: vdec: decoded picture buffer handling during reconfig sequence")
Signed-off-by: Ameer Hamza <amhamza.mgc@gmail.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/platform/qcom/venus/helpers.c

@@ -189,7 +189,6 @@ int venus_helper_alloc_dpb_bufs(struct venus_inst *inst)
 		buf->va = dma_alloc_attrs(dev, buf->size, &buf->da, GFP_KERNEL,
 					  buf->attrs);
 		if (!buf->va) {
-			kfree(buf);
 			ret = -ENOMEM;
 			goto fail;
 		}
@@ -209,6 +208,7 @@ int venus_helper_alloc_dpb_bufs(struct venus_inst *inst)
 	return 0;
 
 fail:
+	kfree(buf);
 	venus_helper_free_dpb_bufs(inst);
 	return ret;
 }