BIO_debug_callback: Fix output on 64-bit machines

BIO_debug_callback() no longer assumes the hexadecimal representation of
a pointer fits in 8 characters.
Signed-off-by: NRichard Levitte <levitte@openssl.org>
Reviewed-by: NMatt Caswell <matt@openssl.org>

crypto/bio/bio_cb.c

@@ -70,14 +70,17 @@ long BIO_debug_callback(BIO *bio, int cmd, const char *argp,
     char buf[256];
     char *p;
     long r = 1;
+    int len;
     size_t p_maxlen;
 
     if (BIO_CB_RETURN & cmd)
         r = ret;
 
-    BIO_snprintf(buf, sizeof buf, "BIO[%08lX]:", (unsigned long)bio);
-    p = &(buf[14]);
-    p_maxlen = sizeof buf - 14;
+    len = BIO_snprintf(buf,sizeof buf,"BIO[%p]: ",(void *)bio);
+
+    p = buf + len;
+    p_maxlen = sizeof(buf) - len;
+
     switch (cmd) {
     case BIO_CB_FREE:
         BIO_snprintf(p, p_maxlen, "Free - %s\n", bio->method->name);