obmc-console: Clean up invalid sign comparisons

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: I83fae6857620ca2913952bea597c1299dd962620
diff --git a/log-handler.c b/log-handler.c
index 6d31be6..b1128cd 100644
--- a/log-handler.c
+++ b/log-handler.c
@@ -37,7 +37,7 @@
 	int				fd;
 	size_t				size;
 	size_t				maxsize;
-	int				pagesize;
+	size_t				pagesize;
 	char				*log_filename;
 	char				*rotate_filename;
 };