intel_telemetry_pltdrv: Silence an uninitialized variable warning

Presumably "pss_period" and "ioss_period" can't both be zero, but this
function is never called so we can't infer that using static analysis
alone.

Silence the warning by setting "ret" to zero.
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NDarren Hart <dvhart@linux.intel.com>

drivers/platform/x86/intel_telemetry_pltdrv.c

@@ -659,7 +659,7 @@ static int telemetry_plt_update_events(struct telemetry_evtconfig pss_evtconfig,
 static int telemetry_plt_set_sampling_period(u8 pss_period, u8 ioss_period)
 {
 	u32 telem_ctrl = 0;
-	int ret;
+	int ret = 0;
 
 	mutex_lock(&(telm_conf->telem_lock));
 	if (ioss_period) {