more -Wall warning fixes from Cristian Ionescu-Idbohrn.

This time it resulted in small code changes:

function                                             old     new   delta
nexpr                                                820     828      +8
tail_main                                           1200    1202      +2
wrapf                                                166     167      +1
parse_mount_options                                  227     209     -18
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/1 up/down: 11/-18)             Total: -7 bytes

1 files changed, 1 insertions, 1 deletions

diff --git a/coreutils/stty.c b/coreutils/stty.c
index 298fb5b70..a17955a6a 100644
--- a/coreutils/stty.c
+++ b/coreutils/stty.c
@@ -710,7 +710,7 @@ static void wrapf(const char *message, ...)
 {
 	char buf[128];
 	va_list args;
-	int buflen;
+	unsigned buflen;
 
 	va_start(args, message);
 	buflen = vsnprintf(buf, sizeof(buf), message, args);