* lisp/net/tramp-adb.el (tramp-adb-prompt): Remove repetition of expression

matching an empty string.

Author: albinus

lisp/net/tramp-adb.el

@@ -53,7 +53,7 @@ It is used for TCP/IP devices."
   "When this method name is used, forward all calls to Android Debug Bridge.")
 
 (defcustom tramp-adb-prompt
-  "^[[:digit:]]*|?\\(?:[[:alnum:]\e;[]*@?[[:alnum:]]*[^#\\$]*\\)?[#\\$][[:space:]]"
+  "^[[:digit:]]*|?[[:alnum:]\e;[]*@?[[:alnum:]]*[^#\\$]*[#\\$][[:space:]]"
   "Regexp used as prompt in almquist shell."
   :type 'string
   :version "24.4"