[media] media: venus: hfi_cmds: fix variable dereferenced before check

This fixes a warning found when building the driver with gcc7:

drivers/media/platform/qcom/venus/hfi_cmds.c:415
pkt_session_set_property_1x() warn: variable dereferenced before
check 'pkt' (see line 412)
drivers/media/platform/qcom/venus/hfi_cmds.c:1177
pkt_session_set_property_3xx() warn: variable dereferenced before
check 'pkt' (see line 1174)
Signed-off-by: NStanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@s-opensource.com>

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

@@ -409,12 +409,14 @@ static int pkt_session_get_property_1x(struct hfi_session_get_property_pkt *pkt,
 static int pkt_session_set_property_1x(struct hfi_session_set_property_pkt *pkt,
 				       void *cookie, u32 ptype, void *pdata)
 {
-	void *prop_data = &pkt->data[1];
+	void *prop_data;
 	int ret = 0;
 
 	if (!pkt || !cookie || !pdata)
 		return -EINVAL;
 
+	prop_data = &pkt->data[1];
+
 	pkt->shdr.hdr.size = sizeof(*pkt);
 	pkt->shdr.hdr.pkt_type = HFI_CMD_SESSION_SET_PROPERTY;
 	pkt->shdr.session_id = hash32_ptr(cookie);
@@ -1171,12 +1173,14 @@ static int
 pkt_session_set_property_3xx(struct hfi_session_set_property_pkt *pkt,
 			     void *cookie, u32 ptype, void *pdata)
 {
-	void *prop_data = &pkt->data[1];
+	void *prop_data;
 	int ret = 0;
 
 	if (!pkt || !cookie || !pdata)
 		return -EINVAL;
 
+	prop_data = &pkt->data[1];
+
 	pkt->shdr.hdr.size = sizeof(*pkt);
 	pkt->shdr.hdr.pkt_type = HFI_CMD_SESSION_SET_PROPERTY;
 	pkt->shdr.session_id = hash32_ptr(cookie);