powerpc/boot: Fix do_div for 64bit wrapper

When the boot wrapper is compiled in 64bit, there is no need to
use __div64_32.

Signed-off-by: Cédric Le Goater <[e-mail]>
Signed-off-by: Benjamin Herrenschmidt <[e-mail]>

arch/powerpc/boot/stdio.c

···
 	return sc - s;
 }
 
+#ifdef __powerpc64__
+
+# define do_div(n, base) ({						\
+	unsigned int __base = (base);					\
+	unsigned int __rem;						\
+	__rem = ((unsigned long long)(n)) % __base;			\
+	(n) = ((unsigned long long)(n)) / __base;			\
+	__rem;								\
+})
+
+#else
+
 extern unsigned int __div64_32(unsigned long long *dividend,
 			       unsigned int divisor);
 
···
 		__rem = __div64_32(&(n), __base);			\
 	__rem;								\
  })
+
+#endif /* __powerpc64__ */
 
 static int skip_atoi(const char **s)
 {