fix 'show kernel mbuf' command on -current after mbuf.h,v r1.266
from upstream
Index: stats.c
--- stats.c.orig
+++ stats.c
@@ -782,7 +782,7 @@ mbpr(void)
memset(&seen, 0, sizeof(seen));
- if (nmbtypes != MBSTAT_COUNT) {
+ if (nmbtypes != MT_NTYPES) {
printf("%% mbpr: unexpected change to mbstat; check source\n");
return;
}