removed .expired? dead code functions

not used anywhere. also, initialized an ivar in ssl class

lib/httpx/connection.rb

@@ -139,12 +139,6 @@ module HTTPX
       ) && @options == options
     end
 
-    def expired?
-      return false unless @io
-
-      @io.expired?
-    end
-
     def mergeable?(connection)
       return false if @state == :closing || @state == :closed || !@io
 

lib/httpx/io/ssl.rb

@@ -19,6 +19,7 @@ module HTTPX
     def initialize(_, _, options)
       super
 
+      @ssl_session = nil
       ctx_options = TLS_OPTIONS.merge(options.ssl)
       @sni_hostname = ctx_options.delete(:hostname) || @hostname
 
@@ -84,10 +85,6 @@ module HTTPX
       @state == :negotiated
     end
 
-    def expired?
-      super || ssl_session_expired?
-    end
-
     def ssl_session_expired?
       @ssl_session.nil? || Process.clock_gettime(Process::CLOCK_REALTIME) >= (@ssl_session.time.to_f + @ssl_session.timeout)
     end

lib/httpx/io/tcp.rb

@@ -174,17 +174,6 @@ module HTTPX
       @state == :idle || @state == :closed
     end
 
-    def expired?
-      # do not mess with external sockets
-      return false if @options.io
-
-      return true if @addresses.empty?
-
-      resolver_addresses = Resolver.nolookup_resolve(@hostname)
-
-      (Array(resolver_addresses) & @addresses).empty?
-    end
-
     # :nocov:
     def inspect
       "#<#{self.class}:#{object_id} " \

lib/httpx/io/unix.rb

@@ -56,10 +56,6 @@ module HTTPX
       true
     end
 
-    def expired?
-      false
-    end
-
     # :nocov:
     def inspect
       "#<#{self.class}:#{object_id} @path=#{@path}) @state=#{@state})>"

sig/connection.rbs

@@ -62,8 +62,6 @@ module HTTPX
 
     def match?: (URI::Generic uri, Options options) -> bool
 
-    def expired?: () -> boolish
-
     def mergeable?: (Connection connection) -> bool
 
     def coalesce!: (instance connection) -> void

sig/io/tcp.rbs

@@ -54,8 +54,6 @@ module HTTPX
 
     def connected?: () -> bool
 
-    def expired?: () -> boolish
-
     def closed?: () -> bool
 
     # :nocov:

sig/io/unix.rbs

@@ -19,7 +19,6 @@ module HTTPX
 
     def connect: () -> void
 
-    def expired?: () -> bool
     private
 
     def build_socket: () -> Socket