Minor sbox fixes.

Rev: nettle/serpent-encrypt.c:1.11

serpent-encrypt.c

@@ -164,10 +164,10 @@
 */
 #define SBOX3(x0, x1, x2, x3, y0, y1, y2, y3)	\
   do {							\
-    y2  = x0 ^ x2;					\
+    y1  = x0 ^ x2;					\
     y0  = x0 | x3;					\
     y3  = x0 & x3;					\
-    y1  = y2 & y0;					\
+    y1 &= y0;						\
     y3 |= x1;						\
     y2  = x0 & x1;					\
     y2 |= x2;						\
@@ -211,7 +211,7 @@
   do {							\
     y3  = x0 | x1;					\
     y2  = x1 | x2;					\
-    y2  = x0 ^ y2;					\
+    y2 ^= x0;						\
     y3 &= x3;						\
     y0  = x1 ^ x3;					\
     x3 |= y2;						\