[PATCH] Fix sign checks in copy_from_read_buf() in 2.4

[Horms]

Applologies if this is already pending, but the signdness fix for
copy_from_read_buf() in  2.6 seems to be needed for 2.4 as well.

This relates to the bugs reported in this document
http://www.guninski.com/where_do_you_want_billg_to_go_today_3.html

-- 
Horms

Backport of copy_from_read_buf() signedness fix from 2.6

Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>

===== drivers/char/n_tty.c 1.7 vs edited =====
--- 1.7/drivers/char/n_tty.c	2004-12-16 22:57:23 +09:00
+++ edited/drivers/char/n_tty.c	2005-03-23 13:08:37 +09:00
@@ -1095,7 +1095,7 @@
 
 {
 	int retval;
-	ssize_t n;
+	size_t n;
 	unsigned long flags;
 
 	retval = 0;
-
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