fuse: Convert to kstrtoul_from_user

This patch replaces the code for getting an number from a
userspace buffer by a simple call to kstroul_from_user.
This makes it easier to read and less error prone.
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>

fs/fuse/control.c

@@ -75,19 +75,13 @@ static ssize_t fuse_conn_limit_write(struct file *file, const char __user *buf,
 				     unsigned global_limit)
 {
 	unsigned long t;
-	char tmp[32];
 	unsigned limit = (1 << 16) - 1;
 	int err;
 
-	if (*ppos || count >= sizeof(tmp) - 1)
-		return -EINVAL;
-
-	if (copy_from_user(tmp, buf, count))
+	if (*ppos)
 		return -EINVAL;
 
-	tmp[count] = '\0';
-
-	err = strict_strtoul(tmp, 0, &t);
+	err = kstrtoul_from_user(buf, count, 0, &t);
 	if (err)
 		return err;