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sys: fix not initializing kproc buffer

--- a/sys.c

+++ b/sys.c

@@ -82,6 +82,7 @@

 	if((fd = open("/dev/kbd", OREAD)) < 0)

 		sysfatal("kproc: %r");

 	memset(buf, 0, sizeof buf);

+	memset(down, 0, sizeof down);

 	for(;;){

 		if(buf[0] != 0){

 			n = strlen(buf)+1;

@@ -119,7 +120,6 @@

 		nbsendul(tmc, 0);

 	}

 }

-

 void

 sim(void)