server/client: add FD_NET debug clues

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/log.h b/log.h
index 916f464..f201191 100644
--- a/log.h
+++ b/log.h
@@ -8,6 +8,7 @@
 
 extern int log_err(const char *format, ...);
 extern int log_info(const char *format, ...);
+extern int log_local(const char *format, ...);
 
 #define log_valist(str, args)	vfprintf(f_out, (str), (args))