tools: xenconsole: cleanup when clock_gettime fails.

All other error paths in the infinite loop in handle_io use break, so
as to free resources.

CID: 1351226

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>

tools/console/daemon/io.c

@@ -1053,7 +1053,7 @@ void handle_io(void)
 						 POLLIN|POLLPRI);
 
 		if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0)
-			return;
+			break;
 		now = ((long long)ts.tv_sec * 1000) + (ts.tv_nsec / 1000000);
 
 		/* Re-calculate any event counter allowances & unblock