[media] s3c-camif: Remove redundant NULL check

clk_unprepare checks for NULL pointer. Hence convert IS_ERR_OR_NULL
to IS_ERR only.
[s.nawrocki: added initialisation of the clock array to ERR_PTR() value]
Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/platform/s3c-camif/camif-core.c

@@ -341,10 +341,11 @@ static void camif_clk_put(struct camif_dev *camif)
 	int i;
 
 	for (i = 0; i < CLK_MAX_NUM; i++) {
-		if (IS_ERR_OR_NULL(camif->clock[i]))
+		if (IS_ERR(camif->clock[i]))
 			continue;
 		clk_unprepare(camif->clock[i]);
 		clk_put(camif->clock[i]);
+		camif->clock[i] = ERR_PTR(-EINVAL);
 	}
 }
 
@@ -352,6 +353,9 @@ static int camif_clk_get(struct camif_dev *camif)
 {
 	int ret, i;
 
+	for (i = 1; i < CLK_MAX_NUM; i++)
+		camif->clock[i] = ERR_PTR(-EINVAL);
+
 	for (i = 0; i < CLK_MAX_NUM; i++) {
 		camif->clock[i] = clk_get(camif->dev, camif_clocks[i]);
 		if (IS_ERR(camif->clock[i])) {