wsd: net: always clear SSL errors after failed IO

We unconditionally clears the SSL error
queue when errors had been found/handled.

Change-Id: Idceb4582106ece08f9e91200f5c66089041b77a4
Signed-off-by: Ashod Nakashian <ashod.nakashian@collabora.co.uk>

net/SslSocket.hpp

@@ -16,6 +16,7 @@
 #include <net/Socket.hpp>
 
 #include <openssl/ssl.h>
+#include <openssl/err.h>
 
 #include <cerrno>
 #include <sstream>
@@ -313,6 +314,8 @@ class SslStreamSocket final : public StreamSocket
         const int ret = handleSslError(rc, last_errno, context);
         errno = last_errno; // Restore errno.
 
+        ERR_clear_error(); // Make sure we leave no errors in the queue.
+
         return ret;
     }