bug#64977: 29.1; `auth-source-macos-keychain-search' handles :user key incorrectly

[LdBeth]

Right after switched from 28.2, my config that uses `auth-source.el'
to retrieve IRC password from macOS keychain stopped working.

Here is the backtrace, apparently there is a function in the chain
forget to handle the :user provided as a list when searching.

Debugger entered--Lisp error: (wrong-type-argument stringp ("ldb"))
  call-process("/usr/bin/security" nil t nil "find-internet-password" "-g" "-s" 
"irc.libera.chat" "-a" ("ldb") "-r" "\"irc\"")
  apply(call-process "/usr/bin/security" nil t nil ("find-internet-password" 
"-g" "-s" "irc.libera.chat" "-a" ("ldb") "-r" "\"irc\""))
  auth-source-macos-keychain-search-items("default" macos-keychain-internet 
5000 "irc.libera.chat" "\"irc\"" :type macos-keychain-internet :require 
(:secret) :user ("ldb") :require (:secret))
  apply(auth-source-macos-keychain-search-items "default" 
macos-keychain-internet 5000 "irc.libera.chat" "\"irc\"" (:type 
macos-keychain-internet :require (:secret) :user ("ldb") :require (:secret)))
  auth-source-macos-keychain-search(:backend #<auth-source-backend 
auth-source-backend-1ff6005ea858> :type macos-keychain-internet :max 5000 
:require (:secret) :create nil :delete nil :user ("ldb") :host 
("irc.libera.chat") :port ("irc") :require (:secret) :max 5000)
  apply(auth-source-macos-keychain-search :backend #<auth-source-backend 
auth-source-backend-1ff6005ea858> :type macos-keychain-internet :max 5000 
:require (:secret) :create nil :delete nil (:user ("ldb") :host 
("irc.libera.chat") :port ("irc") :require (:secret) :max 5000))
  auth-source-search-backends((#<auth-source-backend 
auth-source-backend-1ff6005ea858> #<auth-source-backend 
auth-source-backend-1ff6005ea874>) (:user ("ldb") :host ("irc.libera.chat") 
:port ("irc") :require (:secret) :max 5000) 5000 nil nil (:secret))
  auth-source-search(:user ("ldb") :host ("irc.libera.chat") :port ("irc") 
:require (:secret) :max 5000)
  apply(auth-source-search (:user ("ldb") :host ("irc.libera.chat") :port 
("irc") :require (:secret) :max 5000))
  erc--auth-source-search(:user ("ldb") :host ("irc.libera.chat") :port ("irc") 
:require (:secret))
  apply(erc--auth-source-search (:user ("ldb") :host ("irc.libera.chat") :port 
("irc") :require (:secret)))
  erc-auth-source-search(:user "ldb")
  erc--compute-server-password(nil "ldb")
  erc-determine-parameters("irc.libera.chat" "6697" "ldb" "unknown" "user" nil)
  erc-open("irc.libera.chat" "6697" "ldb" "unknown" t nil nil nil nil nil 
"user" nil)
  erc-tls(:server "irc.libera.chat" :port "6697")
  #f(compiled-function (&rest _) #<bytecode -0x10737acf4eaa4b33>)((push-button 
:args nil :value #("Libera Chat" 0 11 (face font-lock-keyword-face)) :help-echo 
"Start ERC." :action #f(compiled-function (&rest _) #<bytecode 
-0x10737acf4eaa4b33>) :mouse-face highlight :follow-link "\15" :button-overlay 
#<overlay from 165 to 178 in *LaunchPad*> :from #<marker (moves after 
insertion) at 165 in *LaunchPad*> :to #<marker at 178 in *LaunchPad*>) nil)
  widget-apply((push-button :args nil :value #("Libera Chat" 0 11 (face 
font-lock-keyword-face)) :help-echo "Start ERC." :action #f(compiled-function 
(&rest _) #<bytecode -0x10737acf4eaa4b33>) :mouse-face highlight :follow-link 
"\15" :button-overlay #<overlay from 165 to 178 in *LaunchPad*> :from #<marker 
(moves after insertion) at 165 in *LaunchPad*> :to #<marker at 178 in 
*LaunchPad*>) :action nil)
  widget-apply-action((push-button :args nil :value #("Libera Chat" 0 11 (face 
font-lock-keyword-face)) :help-echo "Start ERC." :action #f(compiled-function 
(&rest _) #<bytecode -0x10737acf4eaa4b33>) :mouse-face highlight :follow-link 
"\15" :button-overlay #<overlay from 165 to 178 in *LaunchPad*> :from #<marker 
(moves after insertion) at 165 in *LaunchPad*> :to #<marker at 178 in 
*LaunchPad*>) nil)
  widget-button-press(165)
  funcall-interactively(widget-button-press 165)
  call-interactively(widget-button-press nil nil)
  command-execute(widget-button-press)


In GNU Emacs 29.1 (build 1, x86_64-apple-darwin21.6.0, NS
appkit-2113.60 Version 12.6.8 (Build 21G725)) of 2023-07-31 built on
Costume-Party.localWindowing system distributor 'Apple', version 10.3.2113
System Description:  macOS 12.6.8

Configured using:
 'configure --with-small-ja-dic CPPFLAGS=-I/opt/pkg/include
 LDFLAGS=-L/opt/pkg/lib'

Configured features:
ACL GMP GNUTLS JPEG JSON LIBXML2 MODULES NOTIFY KQUEUE NS PDUMPER PNG
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