Added OPENSSL_assert check as per PR#3377 reported by Rainer Jung <rainer.jung@kippdata.de>

ssl/s3_pkt.c

@@ -644,6 +644,7 @@ int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
 	int i;
 
 	s->rwstate=SSL_NOTHING;
+	OPENSSL_assert(s->s3->wnum <= INT_MAX);
 	tot=s->s3->wnum;
 	s->s3->wnum=0;
 
@@ -667,7 +668,7 @@ int ssl3_write_bytes(SSL *s, int type, const void *buf_, int len)
 	 * buffer ... so we trap and report the error in a way the user
 	 * will notice
 	 */
-	if ( len < tot)
+	if (len < tot)
 		{
 		SSLerr(SSL_F_SSL3_WRITE_BYTES,SSL_R_BAD_LENGTH);
 		return(-1);