Remove unused variable, nits.

1ccb5a6f · Peter H. Froehlich · Frans Kaashoek · 2c60b7f3 · 1ccb5a6f
--- a/sysfile.c
+++ b/sysfile.c
@@ -351,11 +351,10 @@ sys_mknod(void)
 {
  struct inode *ip;
  char *path;
-  int len;
  int major, minor;

  begin_op();
-  if((len=argstr(0, &path)) < 0 ||
+  if((argstr(0, &path)) < 0 ||
     argint(1, &major) < 0 ||
     argint(2, &minor) < 0 ||
     (ip = create(path, T_DEV, major, minor)) == 0){