Typo fix for poly1305 C implementation.

ChangeLog

 2014-01-16  Niels Möller  <nisse@lysator.liu.se>
 
+	* poly1305-internal.c (s2, s3, s4): Fixed macros.
+
 	* poly1305-aes.h (struct poly1305_aes_ctx): Replace struct aes_ctx
 	by struct aes128_ctx.
 	* poly1305-aes.c (poly1305_aes_set_key, poly1305_aes_digest):

poly1305-internal.c

@@ -44,9 +44,9 @@
 #define r3 r.r32[3]
 #define r4 r.r32[4]
 #define s1 r.r32[5]
-#define s2 r.s32[0]
-#define s3 r.s32[1]
-#define s4 r.s32[2]
+#define s2 s32[0]
+#define s3 s32[1]
+#define s4 s32[2]
 
 #define h0 h.h32[0]
 #define h1 h.h32[1]