Constify BN_value_one.

crypto/bn/bn.h

@@ -320,7 +320,7 @@ typedef struct bn_recp_ctx_st
 /*#define BN_ascii2bn(a)	BN_hex2bn(a) */
 /*#define BN_bn2ascii(a)	BN_bn2hex(a) */
 
-BIGNUM *BN_value_one(void);
+const BIGNUM *BN_value_one(void);
 char *	BN_options(void);
 BN_CTX *BN_CTX_new(void);
 void	BN_CTX_init(BN_CTX *c);

crypto/bn/bn_lib.c

@@ -128,7 +128,7 @@ int BN_get_params(int which)
 	else return(0);
 	}
 
-BIGNUM *BN_value_one(void)
+const BIGNUM *BN_value_one(void)
 	{
 	static BN_ULONG data_one=1L;
 	static BIGNUM const_one={&data_one,1,1,0};

doc/crypto/BN_zero.pod

@@ -12,7 +12,7 @@ operations
  int BN_zero(BIGNUM *a);
  int BN_one(BIGNUM *a);
 
- BIGNUM *BN_value_one(void);
+ const BIGNUM *BN_value_one(void);
 
  int BN_set_word(BIGNUM *a, unsigned long w);
  unsigned long BN_get_word(BIGNUM *a);

doc/crypto/bn.pod

@@ -62,7 +62,7 @@ bn - multiprecision integer arithmetics
 
  int BN_zero(BIGNUM *a);
  int BN_one(BIGNUM *a);
- BIGNUM *BN_value_one(void);
+ const BIGNUM *BN_value_one(void);
  int BN_set_word(BIGNUM *a, unsigned long w);
  unsigned long BN_get_word(BIGNUM *a);