Correct warnings.

crypto/bio/bss_bio.c

@@ -229,7 +229,7 @@ static size_t bio_nread0(BIO *bio, char **buf)
 		char dummy;
 		
 		/* avoid code duplication -- nothing available for reading */
-		return bio_read(bio, &dummy, num); /* returns 0 or -1 */
+		return bio_read(bio, &dummy, 1); /* returns 0 or -1 */
 		}
 
 	num = peer_b->len;
@@ -401,7 +401,7 @@ static size_t bio_nwrite0(BIO *bio, char **buf)
 
 static size_t bio_nwrite(BIO *bio, char **buf, size_t num)
 	{
-	struct bio_bio_st *b;
+	struct bio_bio_st *b=bio->ptr;
 	size_t space;
 
 	space = bio_nwrite0(bio, buf);

crypto/rsa/rsa_null.c

@@ -77,7 +77,9 @@ static int RSA_null_public_decrypt(int flen, unsigned char *from,
 		unsigned char *to, RSA *rsa,int padding);
 static int RSA_null_private_decrypt(int flen, unsigned char *from,
 		unsigned char *to, RSA *rsa,int padding);
+#if 0 /* not currently used */
 static int RSA_null_mod_exp(BIGNUM *r0, BIGNUM *i, RSA *rsa);
+#endif
 static int RSA_null_init(RSA *rsa);
 static int RSA_null_finish(RSA *rsa);
 static RSA_METHOD rsa_null_meth={
@@ -126,11 +128,13 @@ static int RSA_null_public_decrypt(int flen, unsigned char *from,
 	return -1;
 	}
 
+#if 0 /* not currently used */
 static int RSA_null_mod_exp(BIGNUM *r0, BIGNUM *I, RSA *rsa)
 	{
 	RSAerr(RSA_F_RSA_NULL, RSA_R_RSA_OPERATIONS_NOT_SUPPORTED);
 	return -1;
 	}
+#endif
 
 static int RSA_null_init(RSA *rsa)
 	{