lib: address -Wunused-but-set-variable

* if.c
  * if_dump(): 'node', 'c'
* distribute.c
  * distribute_list_all(): 'dist'
  * distribute_list(): 'dist'
  * districute_list_prefix_all(): 'dist'
* if_rmap.c
  * if_rmap(): 'if_rmap'
* vty.c
  * vty_accept(): 'vty'
diff --git a/lib/distribute.c b/lib/distribute.c
index 7f84b80..056cd40 100644
--- a/lib/distribute.c
+++ b/lib/distribute.c
@@ -304,7 +304,6 @@
        "Filter outgoing routing updates\n")
 {
   enum distribute_type type;
-  struct distribute *dist;
 
   /* Check of distribute list type. */
   if (strncmp (argv[1], "i", 1) == 0)
@@ -319,7 +318,7 @@
     }
 
   /* Get interface name corresponding distribute list. */
-  dist = distribute_list_set (NULL, type, argv[0]);
+  distribute_list_set (NULL, type, argv[0]);
 
   return CMD_SUCCESS;
 }
@@ -384,7 +383,6 @@
        "Interface name\n")
 {
   enum distribute_type type;
-  struct distribute *dist;
 
   /* Check of distribute list type. */
   if (strncmp (argv[1], "i", 1) == 0)
@@ -398,7 +396,7 @@
     }
 
   /* Get interface name corresponding distribute list. */
-  dist = distribute_list_set (argv[2], type, argv[0]);
+  distribute_list_set (argv[2], type, argv[0]);
 
   return CMD_SUCCESS;
 }       
@@ -463,7 +461,6 @@
        "Filter outgoing routing updates\n")
 {
   enum distribute_type type;
-  struct distribute *dist;
 
   /* Check of distribute list type. */
   if (strncmp (argv[1], "i", 1) == 0)
@@ -478,7 +475,7 @@
     }
 
   /* Get interface name corresponding distribute list. */
-  dist = distribute_list_prefix_set (NULL, type, argv[0]);
+  distribute_list_prefix_set (NULL, type, argv[0]);
 
   return CMD_SUCCESS;
 }       
@@ -546,7 +543,6 @@
        "Interface name\n")
 {
   enum distribute_type type;
-  struct distribute *dist;
 
   /* Check of distribute list type. */
   if (strncmp (argv[1], "i", 1) == 0)
@@ -561,7 +557,7 @@
     }
 
   /* Get interface name corresponding distribute list. */
-  dist = distribute_list_prefix_set (argv[2], type, argv[0]);
+  distribute_list_prefix_set (argv[2], type, argv[0]);
 
   return CMD_SUCCESS;
 }