video: driver: fix an uninitialized variable

Initialized the variable to avoid setting clock
with some random number

CRs-Fixed: 2836558

Change-Id: Id5673210c9e7431aad35b830c9538f8dae4982fc
Signed-off-by: Swarna Vanka <slatha@codeaurora.org>

driver/vidc/src/msm_vidc_power.c

@@ -329,7 +329,8 @@ int msm_vidc_set_clocks(struct msm_vidc_inst* inst)
 	int rc = 0;
 	struct msm_vidc_core* core;
 	struct msm_vidc_inst* temp;
-	u64 freq, rate;
+	u64 freq;
+        u64 rate = 0;
 	u32 data_size;
 	bool increment, decrement;
 	u64 curr_time_ns;