lib: Fix the value returned from get_mac_addresses() on Macintosh computers.

svn path=/trunk/boinc/; revision=21769

checkin_notes

@@ -4363,3 +4363,13 @@ David  17 Jun 2010
 
     html/inc/
         prefs.inc
+
+Charlie  18 Jun 2010
+    - lib: Fix the value returned from get_mac_addresses() on Macintosh 
+        computers.  It has returned the value of kernResult, which is 0
+        on success, instead of true for success, since the routine was 
+        first written in November 2008.  This causes the client to 
+        generate a new random CPID every time the client is launched.
+    
+    lib/
+        mac_address.cpp

lib/mac_address.cpp

@@ -184,7 +184,7 @@ get_mac_addresses(char* addresses) {
     }
     IOObjectRelease(intfIterator);
 
-	return kernResult;
+	return (kernResult == KERN_SUCCESS);
 
 #elif defined(SIOCGIFCONF) || defined(SIOCGLIFCONF)
     char          buf[1024];