if_loop

[Gleydson Soares]

i guess that if ifp might be bpf attached in loop_clone_create() it should be 
detached case destroyed.
Index: if_loop.c
===================================================================
RCS file: /cvs/src/sys/net/if_loop.c,v
retrieving revision 1.44
diff -N -u if_loop.c
--- if_loop.c   7 May 2008 12:58:54 -0000       1.44
+++ if_loop.c   8 Jan 2010 03:34:17 -0000
@@ -221,6 +221,9 @@
        if (ifp == lo0ifp)
                return (EPERM);
 
+#if NBPFILTER > 0
+       bpfdetach(ifp);
+#endif
        if_detach(ifp);
 
        free(ifp, M_DEVBUF);