*: get rid of "MTYPE 0"

A few places are using 0 in place of the MTYPE_* argument.  The
following rewrite of the alloc tracking won't deal with that, so let's
use MTYPE_TMP instead.

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
Acked-by: Donald Sharp <sharpd@cumulusnetworks.com>
diff --git a/ospfd/ospf_snmp.c b/ospfd/ospf_snmp.c
index ebeffa8..1f9b851 100644
--- a/ospfd/ospf_snmp.c
+++ b/ospfd/ospf_snmp.c
@@ -1420,13 +1420,13 @@
 static struct ospf_snmp_if *
 ospf_snmp_if_new (void)
 {
-  return XCALLOC (0, sizeof (struct ospf_snmp_if));
+  return XCALLOC (MTYPE_TMP, sizeof (struct ospf_snmp_if));
 }
 
 static void
 ospf_snmp_if_free (struct ospf_snmp_if *osif)
 {
-  XFREE (0, osif);
+  XFREE (MTYPE_TMP, osif);
 }
 
 void