Refine code based on commnets

Change code layout
Change hostname_len type to size_t
Fix various issues

Signed-off-by: Xiaokang Qian <xiaokang.qian@arm.com>
diff --git a/programs/ssl/ssl_client2.c b/programs/ssl/ssl_client2.c
index 9102ab4..be474d4 100644
--- a/programs/ssl/ssl_client2.c
+++ b/programs/ssl/ssl_client2.c
@@ -3120,7 +3120,7 @@
 
 #if defined(MBEDTLS_X509_CRT_PARSE_C)
         if( ( ret = mbedtls_ssl_set_hostname( &ssl,
-                                                opt.reco_server_name ) ) != 0 )
+                                              opt.reco_server_name ) ) != 0 )
         {
             mbedtls_printf( " failed\n  ! mbedtls_ssl_set_hostname returned %d\n\n",
                             ret );