bn/bn_add.c: fix dead code elimination that went bad.

Reviewed-by: Matt Caswell <matt@openssl.org>

diff --git a/crypto/bn/bn_add.c b/crypto/bn/bn_add.c
index e09451d88bba18c7d793a791dfc100e9813b8187..57e1cdac16626be3d588fc0939167dd93f91ff2a 100644 (file)
--- a/crypto/bn/bn_add.c
+++ b/crypto/bn/bn_add.c
@@ -222,7 +222,7 @@ int BN_usub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b)
                 break;
         }
     }
-    memcpy(rp, ap, sizeof(*rp) * (max - i));
+    memcpy(rp, ap, sizeof(*rp) * dif);
 
     r->top = max;
     r->neg = 0;