w1: fix slave selection on big-endian systems

During test of the w1-gpio driver i found that in "w1.c:679
w1_slave_found()" the device id is converted to little-endian with
"cpu_to_le64()", but its not converted back to cpu format in "w1_io.c:293
w1_reset_select_slave()".

Based on a patch created by Andreas Hummel.

[akpm@linux-foundation.org: remove unneeded cast]
Reported-by: Andreas Hummel <andi_hummel@gmx.de>
Signed-off-by: Evgeniy Polyakov <zbr@ioremap.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/w1/w1_io.c

@@ -356,7 +356,9 @@ int w1_reset_select_slave(struct w1_slave *sl)
 		w1_write_8(sl->master, W1_SKIP_ROM);
 	else {
 		u8 match[9] = {W1_MATCH_ROM, };
-		memcpy(&match[1], (u8 *)&sl->reg_num, 8);
+		u64 rn = le64_to_cpu(*((u64*)&sl->reg_num));
+
+		memcpy(&match[1], &rn, 8);
 		w1_write_block(sl->master, match, 9);
 	}
 	return 0;