crypto: drbg - constify drbg_state_ops structures

The drbg_state_ops structures are never modified, so declare them as const.

Done with the help of Coccinelle.
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/drbg.c

@@ -626,7 +626,7 @@ static int drbg_ctr_generate(struct drbg_state *drbg,
 	return len;
 }
 
-static struct drbg_state_ops drbg_ctr_ops = {
+static const struct drbg_state_ops drbg_ctr_ops = {
 	.update		= drbg_ctr_update,
 	.generate	= drbg_ctr_generate,
 	.crypto_init	= drbg_init_sym_kernel,
@@ -752,7 +752,7 @@ static int drbg_hmac_generate(struct drbg_state *drbg,
 	return len;
 }
 
-static struct drbg_state_ops drbg_hmac_ops = {
+static const struct drbg_state_ops drbg_hmac_ops = {
 	.update		= drbg_hmac_update,
 	.generate	= drbg_hmac_generate,
 	.crypto_init	= drbg_init_hash_kernel,
@@ -1032,7 +1032,7 @@ static int drbg_hash_generate(struct drbg_state *drbg,
  * scratchpad usage: as update and generate are used isolated, both
  * can use the scratchpad
  */
-static struct drbg_state_ops drbg_hash_ops = {
+static const struct drbg_state_ops drbg_hash_ops = {
 	.update		= drbg_hash_update,
 	.generate	= drbg_hash_generate,
 	.crypto_init	= drbg_init_hash_kernel,