drm/amd/powerplay: remove redundant duplicated return check

The check on ret is duplicated in two places, it is redundant code.
Remove it.

Addresses-Coverity: ("Logically dead code")
Fixes: b94afb61 ("drm/amd/powerplay: honor hw limit on fetching metrics data for navi10")
Reviewed-by: NEvan Quan <evan.quan@amd.com>
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/navi10_ppt.c

@@ -941,8 +941,6 @@ static int navi10_get_gpu_power(struct smu_context *smu, uint32_t *value)
 	ret = navi10_get_metrics_table(smu, &metrics);
 	if (ret)
 		return ret;
-	if (ret)
-		return ret;
 
 	*value = metrics.AverageSocketPower << 8;
 
@@ -1001,8 +999,6 @@ static int navi10_get_fan_speed_rpm(struct smu_context *smu,
 	ret = navi10_get_metrics_table(smu, &metrics);
 	if (ret)
 		return ret;
-	if (ret)
-		return ret;
 
 	*speed = metrics.CurrFanSpeed;