- Fixed warning for t if no debugging defined

diff --git a/library/ssl_cli.c b/library/ssl_cli.c
index 08aaf80..95ceea6 100644
--- a/library/ssl_cli.c
+++ b/library/ssl_cli.c
@@ -178,7 +178,9 @@
 
 static int ssl_parse_server_hello( ssl_context *ssl )
 {
+#if defined(POLARSSL_DEBUG_MSG) && defined(POLARSSL_DEBUG_C)
     time_t t;
+#endif
     int ret, i;
     size_t n;
     int ext_len;
@@ -226,10 +228,12 @@
 
     ssl->minor_ver = buf[5];
 
+#if defined(POLARSSL_DEBUG_MSG) && defined(POLARSSL_DEBUG_C)
     t = ( (time_t) buf[6] << 24 )
       | ( (time_t) buf[7] << 16 )
       | ( (time_t) buf[8] <<  8 )
       | ( (time_t) buf[9]       );
+#endif
 
     memcpy( ssl->randbytes + 32, buf + 6, 32 );