drm/imagination: Fix error codes in pvr_device_clk_init()

There is a cut and paste error so this code returns the wrong variable.

Fixes: 1f88f017 ("drm/imagination: Get GPU resources")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1649c66b-3eea-40d2-9687-592124f968cf@moroto.mountain

drivers/gpu/drm/imagination/pvr_device.c

@@ -105,12 +105,12 @@ static int pvr_device_clk_init(struct pvr_device *pvr_dev)
 
 	sys_clk = devm_clk_get_optional(drm_dev->dev, "sys");
 	if (IS_ERR(sys_clk))
-		return dev_err_probe(drm_dev->dev, PTR_ERR(core_clk),
+		return dev_err_probe(drm_dev->dev, PTR_ERR(sys_clk),
 				     "failed to get sys clock\n");
 
 	mem_clk = devm_clk_get_optional(drm_dev->dev, "mem");
 	if (IS_ERR(mem_clk))
-		return dev_err_probe(drm_dev->dev, PTR_ERR(core_clk),
+		return dev_err_probe(drm_dev->dev, PTR_ERR(mem_clk),
 				     "failed to get mem clock\n");
 
 	pvr_dev->core_clk = core_clk;