Merge tag 'printk-for-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/printk...

Merge tag 'printk-for-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux

Pull printk updates from Petr Mladek:

 - Check all mandatory callbacks when registering nbcon consoles

 - Fix some compiler warnings

* tag 'printk-for-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux:
  vsnprintf: drop __printf() attributes on binary printing functions
  printf: convert test_hashed into macro
  printk: nbcon: Check for device_{lock,unlock} callbacks