video: driver: fix uinitalized variables

Intitalize variables to address warnings

Change-Id: Id211e49e5055839b34950f6075e034aa74f4ae0c
Signed-off-by: Deepa Guthyappa Madivalara <quic_dmadival@quicinc.com>

driver/vidc/src/msm_vidc_driver.c

@@ -2568,7 +2568,7 @@ int msm_vidc_flush_ts(struct msm_vidc_inst *inst)
 
 int msm_vidc_update_timestamp_rate(struct msm_vidc_inst *inst, u64 timestamp)
 {
-	struct msm_vidc_timestamp *ts, *prev;
+	struct msm_vidc_timestamp *ts, *prev = NULL;
 	int rc = 0;
 	u32 window_size = 0;
 	u32 timestamp_rate = 0;

driver/vidc/src/msm_vidc_power.c

@@ -484,7 +484,8 @@ int msm_vidc_scale_power(struct msm_vidc_inst *inst, bool scale_buses)
 	struct msm_vidc_buffer *vbuf;
 	u32 data_size = 0;
 	u32 fps;
-	u32 frame_rate, operating_rate, timestamp_rate, input_rate;
+	u32 frame_rate, operating_rate;
+	u32 timestamp_rate = 0, input_rate = 0;
 
 	if (!inst || !inst->core) {
 		d_vpr_e("%s: invalid params %pK\n", __func__, inst);