Do not use state mechanism

Call a dispatch function instead, simplifying the nested select case.

src/_port

@@ -73,11 +73,11 @@ _port() {
     '-y[Perform a dry run.]' \
     '-t[enable trace mode debug facilities on platforms that support it (Mac OS X).]' \
     "1:Port actions:($actions)" \
-    '*:extra:->extra' \
+    '*:extra:_port_dispatch' \
     && return 0
+}
 
-  case "$state" in
-    extra)
+_port_dispatch() {
   case "$words[2]" in
     provides)
       _files
@@ -123,8 +123,6 @@ _port() {
         "pseudo-advanced:Advanced Pseudo-portnames:($pseudo_advanced)"
       ;;
   esac
-      ;;
-  esac
 }
 
 _port_select() {