Fix the type of ASN1_i2d_bio's last argument.

It's supposed to be void*. The only reason this was working was that it was
only called in C which happily casts from void* to T*. (But if called in C++ in
a macro, it breaks.)

Change-Id: I7f765c3572b9b4815ae58da852be1e742de1bd96
Reviewed-on: https://boringssl-review.googlesource.com/5760
Reviewed-by: Adam Langley <agl@google.com>

crypto/asn1/a_i2d_fp.c

diff --git a/crypto/asn1/a_i2d_fp.c b/crypto/asn1/a_i2d_fp.c
index 8a6ce25..74ded78 100644
--- a/crypto/asn1/a_i2d_fp.c
+++ b/crypto/asn1/a_i2d_fp.c
@@ -76,7 +76,7 @@
         return(ret);
         }
 
-int ASN1_i2d_bio(i2d_of_void *i2d, BIO *out, unsigned char *x)
+int ASN1_i2d_bio(i2d_of_void *i2d, BIO *out, void *x)
 	{
 	char *b;
 	unsigned char *p;

include/openssl/asn1.h

diff --git a/include/openssl/asn1.h b/include/openssl/asn1.h
index 401532a..043524d 100644
--- a/include/openssl/asn1.h
+++ b/include/openssl/asn1.h
@@ -949,7 +949,7 @@
 			  CHECKED_PPTR_OF(type, x)))
 
 OPENSSL_EXPORT void *ASN1_item_d2i_bio(const ASN1_ITEM *it, BIO *in, void *x);
-OPENSSL_EXPORT int ASN1_i2d_bio(i2d_of_void *i2d,BIO *out, unsigned char *x);
+OPENSSL_EXPORT int ASN1_i2d_bio(i2d_of_void *i2d,BIO *out, void *x);
 
 #define ASN1_i2d_bio_of(type,i2d,out,x) \
     (ASN1_i2d_bio(CHECKED_I2D_OF(type, i2d), \