sunxi: Fix is_boot0_magic macro

The is_boot0_magic macro is missing parentheses around the macro
argument, breaking any usage with a more complex argument.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/arch/arm/include/asm/arch-sunxi/spl.h b/arch/arm/include/asm/arch-sunxi/spl.h
index 7b99c1a..58cdf80 100644
--- a/arch/arm/include/asm/arch-sunxi/spl.h
+++ b/arch/arm/include/asm/arch-sunxi/spl.h
@@ -19,8 +19,7 @@
 #define SUNXI_BOOTED_FROM_MMC0_HIGH	0x10
 #define SUNXI_BOOTED_FROM_MMC2_HIGH	0x12
 
-
-#define is_boot0_magic(addr)	(memcmp((void *)addr, BOOT0_MAGIC, 8) == 0)
+#define is_boot0_magic(addr)	(memcmp((void *)(addr), BOOT0_MAGIC, 8) == 0)
 
 uint32_t sunxi_get_boot_device(void);