ppc/85xx: Fix compiler warning in nand_spl/.../p1_p2_rdb/nand_boot.c

nand_boot.c: In function 'board_init_f':
nand_boot.c:44: warning: 'sys_clk' may be used uninitialized in this function

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

nand_spl/board/freescale/p1_p2_rdb/nand_boot.c

@@ -41,7 +41,7 @@ DECLARE_GLOBAL_DATA_PTR;
 
 void board_init_f(ulong bootflag)
 {
-	uint plat_ratio, bus_clk, sys_clk;
+	uint plat_ratio, bus_clk, sys_clk = 0;
 	volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
 	volatile ccsr_gpio_t *pgpio = (void *)(CONFIG_SYS_MPC85xx_GPIO_ADDR);
 	uint val, temp, sysclk_mask;