Fix warnings.

ssl/s3_srvr.c

diff --git a/ssl/s3_srvr.c b/ssl/s3_srvr.c
index bc6ece4..5661199 100644
--- a/ssl/s3_srvr.c
+++ b/ssl/s3_srvr.c
@@ -3226,7 +3226,7 @@
 int ssl3_get_next_proto(SSL *s)
 	{
 	int ok;
-	unsigned proto_len, padding_len;
+	int proto_len, padding_len;
 	long n;
 	const unsigned char *p;