bfs: root may always enter directories.

* If you're root, you can now always enter directories, even if they
  don't have the X permission.

src/add-ons/kernel/file_systems/bfs/Inode.cpp

@@ -523,6 +523,8 @@ Inode::CheckPermissions(int accessMode) const
 		// X bits must be set for execute permission
 		permissions = userPermissions | groupPermissions | otherPermissions
 			| R_OK | W_OK;
+		if (IsDirectory())
+			permissions |= X_OK;
 	} else if (uid == (uid_t)fNode.UserID()) {
 		// user is node owner
 		permissions = userPermissions;