Call ERR_clear_error() where necessary

zyklonb.c

@@ -281,6 +281,7 @@ irc_send (struct bot_context *ctx, const char *format, ...)
 	if (ctx->ssl)
 	{
 		// TODO: call SSL_get_error() to detect if a clean shutdown has occured
+		ERR_clear_error ();
 		if (SSL_write (ctx->ssl, str.str, str.len) != (int) str.len)
 		{
 			print_debug ("%s: %s: %s", __func__, "SSL_write",
@@ -1447,6 +1448,7 @@ irc_fill_read_buffer_ssl (struct bot_context *ctx, struct str *buf)
 {
 	int n_read;
 start:
+	ERR_clear_error ();
 	n_read = SSL_read (ctx->ssl, buf->str + buf->len,
 		buf->alloc - buf->len - 1 /* null byte */);