main: fix shadow detection logic

This fired incorrectly:

	Mountpoint "/home/testuser" would shadow cipherdir "/home/testuser.cipher", this is not supported

1 files changed, 1 insertions, 1 deletions

diff --git a/mount.go b/mount.go
index 000d632..3157332 100644
--- a/mount.go
+++ b/mount.go
@@ -38,7 +38,7 @@ func doMount(args *argContainer) int {
 	}
 	// We cannot mount "/home/user/.cipher" at "/home/user" because the mount
 	// will hide ".cipher" also for us.
-	if strings.HasPrefix(args.cipherdir, args.mountpoint) {
+	if args.cipherdir == args.mountpoint || strings.HasPrefix(args.cipherdir, args.mountpoint+"/") {
 		tlog.Fatal.Printf("Mountpoint %q would shadow cipherdir %q, this is not supported",
 			args.mountpoint, args.cipherdir)
 		os.Exit(ErrExitMountPoint)