fixing directory bustage (nsCRT string)

/home/timeless/mozilla/directory/xpcom/base/src/nsLDAPChannel.cpp: In method `nsresult nsLDAPChannel::OnLDAPBind(nsILDAPMessage *)':
/home/timeless/mozilla/directory/xpcom/base/src/nsLDAPChannel.cpp:796: syntax error before `::'
/home/timeless/mozilla/directory/xpcom/base/src/nsLDAPChannel.cpp:798: confused by earlier errors, bailing out
gmake[4]: *** [nsLDAPChannel.o] Error 1
gmake[4]: Leaving directory `/home/timeless/mozilla/obj-xlib-i386-unknown-freebsd4.4/directory/xpcom/base/src'

if (nsCRT::strlen(baseDn) == 0) {

directory/xpcom/base/src/nsLDAPChannel.cpp

@@ -793,7 +793,7 @@ nsLDAPChannel::OnLDAPBind(nsILDAPMessage *aMessage)
     //
     rv = url->GetDn(getter_Copies(baseDn));
     NS_ENSURE_SUCCESS(rv, rv);
-    if (nsCRT::strlen(baseDn) == 0) {
+    if (baseDn.IsEmpty()) {
         return NS_ERROR_MALFORMED_URI;
     }