post, i2c: add missing curly bracket in i2c_post_test

If CONFIG_SYS_POST_I2C_ADDRS is not defined and CONFIG_SYS_POST_I2C
is activated, i2c_probe() is not called in the for statement,
because missing curly bracket.

Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/post/drivers/i2c.c b/post/drivers/i2c.c
index 4a1b1a4..4cbd9f3 100644
--- a/post/drivers/i2c.c
+++ b/post/drivers/i2c.c
@@ -63,11 +63,12 @@
 	unsigned int i;
 #ifndef CONFIG_SYS_POST_I2C_ADDRS
 	/* Start at address 1, address 0 is the general call address */
-	for (i = 1; i < 128; i++)
+	for (i = 1; i < 128; i++) {
 		if (i2c_ignore_device(i))
 			continue;
 		if (i2c_probe (i) == 0)
 			return 0;
+	}
 
 	/* No devices found */
 	return -1;