also remove X_SER_BYTES while were at it

src/per_curve/decaf_gen_tables.tmpl.c

@@ -26,12 +26,12 @@ void API_NS(precompute_wnafs) (
     const API_NS(point_t) base
 );
 static void field_print(const gf f) {
-    unsigned char ser[X_SER_BYTES];
+    unsigned char ser[SER_BYTES];
     gf_serialize(ser,f);
     int b=0, i, comma=0;
     unsigned long long limb = 0;
     printf("{FIELD_LITERAL(");
-    for (i=0; i<X_SER_BYTES; i++) {
+    for (i=0; i<SER_BYTES; i++) {
         limb |= ((uint64_t)ser[i])<<b;
         b += 8;
         if (b >= GF_LIT_LIMB_BITS || i == SER_BYTES-1) {

src/per_field/f_field.tmpl.h

@@ -8,8 +8,7 @@
 
 #define __DECAF_$(gf_shortname)_GF_DEFINED__ 1
 #define NLIMBS ($(gf_impl_bits//8)/sizeof(word_t))
-#define X_SER_BYTES $(((gf_bits-1)//8 + 1))
-#define SER_BYTES $(((gf_bits-2)//8 + 1))
+#define SER_BYTES $(((gf_bits-1)//8 + 1))
 typedef struct gf_$(gf_shortname)_s {
     word_t limb[NLIMBS];
 } __attribute__((aligned(32))) gf_$(gf_shortname)_s, gf_$(gf_shortname)_t[1];
@@ -39,7 +38,7 @@ typedef struct gf_$(gf_shortname)_s {
 #define gf_deserialize    gf_$(gf_shortname)_deserialize
 
 /* RFC 7748 support */
-#define X_PUBLIC_BYTES  X_SER_BYTES
+#define X_PUBLIC_BYTES  SER_BYTES
 #define X_PRIVATE_BYTES X_PUBLIC_BYTES
 #define X_PRIVATE_BITS  $(gf_bits)