make sure fast_s_mp_mul_digs() doesn't BOF This fixes #60 and #80
diff --git a/bn_fast_s_mp_mul_digs.c b/bn_fast_s_mp_mul_digs.c
index 558d151..875798e 100644
--- a/bn_fast_s_mp_mul_digs.c
+++ b/bn_fast_s_mp_mul_digs.c
@@ -87,7 +87,7 @@ int fast_s_mp_mul_digs(const mp_int *a, const mp_int *b, mp_int *c, int digs)
{
mp_digit *tmpc;
tmpc = c->dp;
- for (ix = 0; ix < (pa + 1); ix++) {
+ for (ix = 0; ix < pa; ix++) {
/* now extract the previous digit [below the carry] */
*tmpc++ = W[ix];
}