[lib] hash compare function arguments ought to be const qualified

2008-08-14 Stephen Hemminger <stephen.hemminger@vyatta.com>

	* lib/hash.h: (struct hash) Hash comparator callback really
	  ought to treat storage behind arguments as constant - a compare
	  function with side-effects would be evil.
	* */*.c: Adjust comparator functions similarly, thus fixing at least
	  a few compiler warnings about const qualifier being dropped.

Signed-off-by: Paul Jakma <paul@quagga.net>
diff --git a/bgpd/bgp_ecommunity.c b/bgpd/bgp_ecommunity.c
index 9e7ae1b..c08673c 100644
--- a/bgpd/bgp_ecommunity.c
+++ b/bgpd/bgp_ecommunity.c
@@ -247,15 +247,13 @@
 
 /* Compare two Extended Communities Attribute structure.  */
 int
-ecommunity_cmp (void *arg1, void *arg2)
+ecommunity_cmp (const void *arg1, const void *arg2)
 {
   const struct ecommunity *ecom1 = arg1;
   const struct ecommunity *ecom2 = arg2;
   
-  if (ecom1->size == ecom2->size
-      && memcmp (ecom1->val, ecom2->val, ecom1->size * ECOMMUNITY_SIZE) == 0)
-    return 1;
-  return 0;
+  return (ecom1->size == ecom2->size
+	  && memcmp (ecom1->val, ecom2->val, ecom1->size * ECOMMUNITY_SIZE) == 0);
 }
 
 /* Initialize Extended Comminities related hash. */