arch/parisc/include/asm: use ARRAY_SIZE macro in mmzone.h

Signed-off-by: Nikitas Angelinas <nikitasangelinas@gmail.com>
Signed-off-by: Helge Deller <deller@gmx.de>

arch/parisc/include/asm/mmzone.h

@@ -45,7 +45,7 @@ static inline int pfn_to_nid(unsigned long pfn)
 		return 0;
 
 	i = pfn >> PFNNID_SHIFT;
-	BUG_ON(i >= sizeof(pfnnid_map) / sizeof(pfnnid_map[0]));
+	BUG_ON(i >= ARRAY_SIZE(pfnnid_map));
 	r = pfnnid_map[i];
 	BUG_ON(r == 0xff);