bug#57969: 29.0.50; `device-class' errors when NAME is nil

[Visuwesh]

According to the docstring of `device-class', nil is a valid value for
the NAME argument however it errors out since `x-device-class' uses
`downcase' without checking if NAME is non-nil.  Backtrace is below,

Debugger entered--Lisp error: (wrong-type-argument char-or-string-p nil)
  downcase(nil)
  (let ((downcased-name (downcase name))) (cond ((string-match-p "XTEST" name) 
'test) ((string= "Virtual core pointer" name) 'core-pointer) ((string= "Virtual 
core keyboard" name) 'core-keyboard) ((string-match-p "eraser" downcased-name) 
'eraser) ((string-match-p " pad" downcased-name) 'pad) ((or (or (string-match-p 
"wacom" downcased-name) (string-match-p "pen" downcased-name)) (string-match-p 
"stylus" downcased-name)) 'pen) ((or (string-prefix-p "xwayland-touch:" name) 
(string-match-p "touchscreen" downcased-name)) 'touchscreen) ((or 
(string-match-p "trackpoint" downcased-name) (string-match-p "stick" 
downcased-name)) 'trackpoint) ((or (string-match-p "mouse" downcased-name) 
(string-match-p "optical" downcased-name) (string-match-p "pointer" 
downcased-name)) 'mouse) ((string-match-p "cursor" downcased-name) 'puck) ((or 
(string-match-p "keyboard" downcased-name) (string= name "USB USB Keykoard")) 
'keyboard) ((string-match-p "button" downcased-name) 'power-button) 
((string-match-p "touchpad" downcased-name) 'touchpad) ((or (string-match-p 
"midi" downcased-name) (string-match-p "piano" downcased-name)) 'piano) ((or 
(string-match-p "wskbd" downcased-name) (and (string-match-p "/dev" 
downcased-name) (string-match-p "kbd" downcased-name))) 'keyboard)))
  x-device-class(nil)
  device-class(#<frame *unsent mail to bug-gnu-emacs@gnu.org* emacs@astatine 
0x562ae5daf070> nil)
  eval((device-class last-event-frame nil) nil)
  elisp--eval-last-sexp(nil)
  eval-last-sexp(nil)
  eros-eval-last-sexp(nil)
  funcall-interactively(eros-eval-last-sexp nil)
  call-interactively(eros-eval-last-sexp nil nil)
  command-execute(eros-eval-last-sexp)


In GNU Emacs 29.0.50 (build 18, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.16.0, Xaw scroll bars) of 2022-09-20 built on astatine
Repository revision: cd2168cd131852279a7d9257c7dff45224c9d6a9
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12101004
System Description: Debian GNU/Linux bookworm/sid

Configured using:
 'configure --with-sound=alsa --with-x-toolkit=lucid --with-json
 --without-xaw3d --without-gconf --without-libsystemd'
Configured features:
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Load-path shadows:
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