apparmor: Fix wrong determination whether crun is confined

Closes: containers#1385
Signed-off-by: 😎Mostafa Emami <mustafaemami@gmail.com>

src/libcrun/utils.c

@@ -941,7 +941,7 @@ is_current_process_confined (libcrun_error_t *err)
   if (UNLIKELY (bytes_read < 0))
     return crun_make_error (err, errno, "error reading file `%s`", attr_path);
 
-  return (strncmp (buf, "unconfined", bytes_read) != 0 && buf[0] != '\0');
+  return (strstr(buf, "unconfined") == NULL);
 }
 
 int