media: venus: venus_helper_get_bufreq(): req is never NULL

Fix a smatch error:

drivers/media/platform/qcom/venus/helpers.c: drivers/media/platform/qcom/venus/helpers.c:678 venus_helper_get_bufreq() error: we previously assumed 'req' could be null (see line 674)

After checking how venus_helper_get_bufreq() is called it is clear that
req is never NULL, so just drop the checks.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
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

@@ -671,8 +671,7 @@ int venus_helper_get_bufreq(struct venus_inst *inst, u32 type,
 	unsigned int i;
 	int ret;
 
-	if (req)
-		memset(req, 0, sizeof(*req));
+	memset(req, 0, sizeof(*req));
 
 	if (type == HFI_BUFFER_OUTPUT || type == HFI_BUFFER_OUTPUT2)
 		req->count_min = inst->fw_min_cnt;
@@ -694,8 +693,7 @@ int venus_helper_get_bufreq(struct venus_inst *inst, u32 type,
 		if (hprop.bufreq[i].type != type)
 			continue;
 
-		if (req)
-			memcpy(req, &hprop.bufreq[i], sizeof(*req));
+		memcpy(req, &hprop.bufreq[i], sizeof(*req));
 		ret = 0;
 		break;
 	}