crc32: use __BYTE_ORDER macro for endian detection.

Since crc32.c contains a nifty test program that can be executed in user
space, make sure endian detection works reliably in user space too.

Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

lib/crc32.c

diff --git a/lib/crc32.c b/lib/crc32.c
index 4855995..3087ed8 100644
--- a/lib/crc32.c
+++ b/lib/crc32.c
@@ -50,7 +50,7 @@
 static inline u32
 crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 (*tab)[256])
 {
-# ifdef __LITTLE_ENDIAN
+# if __BYTE_ORDER == __LITTLE_ENDIAN
 #  define DO_CRC(x) crc = tab[0][(crc ^ (x)) & 255] ^ (crc >> 8)
 #  define DO_CRC4 crc = tab[3][(crc) & 255] ^ \
 		tab[2][(crc >> 8) & 255] ^ \