Index: uipc_sockbuf.c
===================================================================
--- uipc_sockbuf.c	(revision 186704)
+++ uipc_sockbuf.c	(working copy)
@@ -577,10 +577,6 @@
 
 	if (m0 == 0)
 		return;
-	m = sb->sb_mb;
-	if (m)
-		while (m->m_nextpkt)
-			m = m->m_nextpkt;
 	/*
 	 * Put the first mbuf on the queue.  Note this permits zero length
 	 * records.
@@ -588,17 +584,15 @@
 	sballoc(sb, m0);
 	SBLASTRECORDCHK(sb);
 	SBLINKRECORD(sb, m0);
-	if (m)
-		m->m_nextpkt = m0;
-	else
-		sb->sb_mb = m0;
-	m = m0->m_next;
-	m0->m_next = 0;
-	if (m && (m0->m_flags & M_EOR)) {
-		m0->m_flags &= ~M_EOR;
-		m->m_flags |= M_EOR;
+	if (m0->m_next != NULL) {
+		m = m0->m_next;
+		m0->m_next = NULL;
+		if (m0->m_flags & M_EOR) {
+			m0->m_flags &= ~M_EOR;
+			m->m_flags |= M_EOR;
+		}
+		sbcompress(sb, m, m0);
 	}
-	sbcompress(sb, m, m0);
 }
 
 /*