mfd: rc5t583: Fix warning messages

Two variables named master_int and sleepseq_val, were just
declared without initialization. Pointers to these variables
were passed to mfd read function. After that these variables
were used for some of the logical operations.

Though logically there is nothing wrong, compiler is complaining
that the variables may be used uninitialized.

Hence fixing these warning messages by initializing them.

Signed-off-by: Venu Byravarasu <vbyravarasu@nvidia.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

drivers/mfd/rc5t583-irq.c

@@ -255,7 +255,7 @@ static irqreturn_t rc5t583_irq(int irq, void *data)
 {
 	struct rc5t583 *rc5t583 = data;
 	uint8_t int_sts[RC5T583_MAX_INTERRUPT_MASK_REGS];
-	uint8_t master_int;
+	uint8_t master_int = 0;
 	int i;
 	int ret;
 	unsigned int rtc_int_sts = 0;