mx6sabresd: Use 'int' for return values

The variable 'ret' is used to store the value returned by pfuze_mode_init(),
so it should of type 'int' instead of 'unsigned int' in order to correctly
handle negative numbers.

Fix the variable type.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>

board/freescale/mx6sabresd/mx6sabresd.c

@@ -631,7 +631,8 @@ int board_init(void)
 int power_init_board(void)
 {
 	struct pmic *p;
-	unsigned int reg, ret;
+	unsigned int reg;
+	int ret;
 
 	p = pfuze_common_init(I2C_PMIC);
 	if (!p)