[PATCH] uml: fix format errors

Now that GCC warns about format errors, fix them.  Nothing able to cause a
crash, however.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/os-Linux/drivers/ethertap_user.c

@@ -40,7 +40,7 @@ static void etap_change(int op, unsigned char *addr, unsigned char *netmask,
 			int fd)
 {
 	struct addr_change change;
-	void *output;
+	char *output;
 	int n;
 
 	change.what = op;