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ip/cifsd: exit to close connection when we get malformed smb header (fixes linux mount hang)

--- a/sys/src/cmd/ip/cifsd/main.c

+++ b/sys/src/cmd/ip/cifsd/main.c

@@ -85,10 +85,12 @@

 	if((n = unpack(h, h, e, "lb____bww{.________}__wwww", &magic,

 		&r.cmd, &r.flags, &r.flags2, &hpid, &sig, &r.tid, &r.pid, &r.uid, &r.mid)) == 0){

 		logit("bad smb header");

+		exits("botch");

 		return;

 	}

 	if(magic != MAGIC){

 		logit("bad smb magic");

+		exits("botch");

 		return;

 	}

 	r.pid |= hpid<<16;