fix coding style issues

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/ssl_tls13_server.c b/library/ssl_tls13_server.c
index 1b553e3..0deeb76 100644
--- a/library/ssl_tls13_server.c
+++ b/library/ssl_tls13_server.c
@@ -1106,7 +1106,6 @@
     MBEDTLS_SSL_DEBUG_MSG(
         3, ( "switching to new transform spec for outbound data" ) );
 
-
     return( 0 );
 }
 
@@ -1124,6 +1123,7 @@
     unsigned char *p = buf;
     size_t extensions_len = 0;
     unsigned char *p_extensions_len;
+
     *out_len = 0;
 
     MBEDTLS_SSL_CHK_BUF_PTR( p, end, 2 );