nvmem: sunxi_sid: remove unused variable in probe

This patch fixes below warning:
sunxi_sid.c:157:6: warning: unused variable 'ret' [-Wunused-variable]
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/nvmem/sunxi_sid.c

@@ -154,7 +154,7 @@ static int sunxi_sid_probe(struct platform_device *pdev)
 	struct resource *res;
 	struct nvmem_device *nvmem;
 	struct sunxi_sid *sid;
-	int ret, i, size;
+	int i, size;
 	char *randomness;
 	const struct sunxi_sid_cfg *cfg;