Use 'i' as parameter name not 'I'.

The latter causes problems when complex.h is #included.
Reviewed-by: NTim Hudson <tjh@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7233)

crypto/rsa/rsa_meth.c

@@ -163,13 +163,13 @@ int RSA_meth_set_priv_dec(RSA_METHOD *meth,
 
     /* Can be null */
 int (*RSA_meth_get_mod_exp(const RSA_METHOD *meth))
-    (BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx)
+    (BIGNUM *r0, const BIGNUM *i, RSA *rsa, BN_CTX *ctx)
 {
     return meth->rsa_mod_exp;
 }
 
 int RSA_meth_set_mod_exp(RSA_METHOD *meth,
-                         int (*mod_exp) (BIGNUM *r0, const BIGNUM *I, RSA *rsa,
+                         int (*mod_exp) (BIGNUM *r0, const BIGNUM *i, RSA *rsa,
                                          BN_CTX *ctx))
 {
     meth->rsa_mod_exp = mod_exp;

doc/man3/RSA_meth_new.pod

@@ -64,10 +64,10 @@ RSA_meth_get_multi_prime_keygen, RSA_meth_set_multi_prime_keygen
                                            unsigned char *to, RSA *rsa, int padding));
 
  /* Can be null */
- int (*RSA_meth_get_mod_exp(const RSA_METHOD *meth))(BIGNUM *r0, const BIGNUM *I,
+ int (*RSA_meth_get_mod_exp(const RSA_METHOD *meth))(BIGNUM *r0, const BIGNUM *i,
                                                      RSA *rsa, BN_CTX *ctx);
  int RSA_meth_set_mod_exp(RSA_METHOD *rsa,
-                          int (*mod_exp)(BIGNUM *r0, const BIGNUM *I, RSA *rsa,
+                          int (*mod_exp)(BIGNUM *r0, const BIGNUM *i, RSA *rsa,
                                          BN_CTX *ctx));
 
  /* Can be null */

include/openssl/rsa.h

@@ -456,9 +456,9 @@ int RSA_meth_set_priv_dec(RSA_METHOD *rsa,
                                            unsigned char *to, RSA *rsa,
                                            int padding));
 int (*RSA_meth_get_mod_exp(const RSA_METHOD *meth))
-    (BIGNUM *r0, const BIGNUM *I, RSA *rsa, BN_CTX *ctx);
+    (BIGNUM *r0, const BIGNUM *i, RSA *rsa, BN_CTX *ctx);
 int RSA_meth_set_mod_exp(RSA_METHOD *rsa,
-                         int (*mod_exp) (BIGNUM *r0, const BIGNUM *I, RSA *rsa,
+                         int (*mod_exp) (BIGNUM *r0, const BIGNUM *i, RSA *rsa,
                                          BN_CTX *ctx));
 int (*RSA_meth_get_bn_mod_exp(const RSA_METHOD *meth))
     (BIGNUM *r, const BIGNUM *a, const BIGNUM *p,