For consistency sake, use >= MINCLSIZE rather than > MINCLSIZE to determine

whether or not to allocate a full mbuf cluster rather than just a plain
mbuf when adding on additional mbufs in m_getm().  In practice, there wasn't
any resulting mem trashing since m_getm() doesn't ever allocate an mbuf with
a packet header, and MINCLSIZE is the available payload in an mbuf with a
header rather than the available payload in a plain mbuf.

Discussed with: 	andre (lightly)

sys/kern/uipc_mbuf.c

@@ -131,7 +131,7 @@ m_getm(struct mbuf *m, int len, int how, short type)
 		cur = (cur->m_next = mb);
 	}
 	if (rem > 0) {
-		mb = (rem > MINCLSIZE) ?
+		mb = (rem >= MINCLSIZE) ?
 		    m_getcl(how, type, 0) : m_get(how, type);
 		if (mb == NULL)
 			goto failed;