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 <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/nvmem/sunxi_sid.c

···
 	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;