Improve -Z error reporting.

The most likely reason for setfscreatecon to fail is that you don't have permission, and that's reported by the write return EACCES. There isn't really a "bad" context; they're just strings.

Before:

  $ adb shell mkdir -Z x y
  mkdir: bad -Z 'x'

After:

  $ adb shell mkdir -Z x y
  mkdir: -Z 'x' failed: Permission denied

Other than this, the ToT mkdir works fine with SELinux.

1 files changed, 1 insertions, 1 deletions

diff --git a/toys/lsb/mknod.c b/toys/lsb/mknod.c
index d6cd65ce..39073fad 100644
--- a/toys/lsb/mknod.c
+++ b/toys/lsb/mknod.c
@@ -52,7 +52,7 @@ void mknod_main(void)
 
   if (toys.optflags & FLAG_Z)
     if (-1 == lsm_set_create(TT.arg_context))
-      error_exit("bad -Z '%s'", TT.arg_context);
+      perror_exit("-Z '%s' failed", TT.arg_context);
   if (mknod(*toys.optargs, mode|modes[type], makedev(major, minor)))
     perror_exit("%s", *toys.optargs);
 }