power_i2c.c: Fix unused variable warning

The variable ret was added but never set as we did not make calls to
other functions that we needed to check the return value on.

Fixes: 505cf4750a ("power: change from meaningless value to error number")
Signed-off-by: Tom Rini <trini@konsulko.com>

drivers/power/power_i2c.c

@@ -19,7 +19,6 @@
 int pmic_reg_write(struct pmic *p, u32 reg, u32 val)
 {
 	unsigned char buf[4] = { 0 };
-	int ret;
 
 	if (check_reg(p, reg))
 		return -EINVAL;