Fix missing return statement ssl_server2 idling
Also, introduce MBEDTLS_EINTR locally in net_sockets.c
for the platform-dependent return code macro used by
the `select` call to indicate that the poll was interrupted
by a signal handler: On Unix, the corresponding macro is EINTR,
while on Windows, it's WSAEINTR.
diff --git a/programs/ssl/ssl_client2.c b/programs/ssl/ssl_client2.c
index 232dc64..58f12c9 100644
--- a/programs/ssl/ssl_client2.c
+++ b/programs/ssl/ssl_client2.c
@@ -462,7 +462,7 @@
poll_type = MBEDTLS_NET_POLL_READ;
#if !defined(MBEDTLS_TIMING_C)
else
- return;
+ return( 0 );
#endif
while( 1 )
