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mev,tev: fix not initializing kproc buffer

--- a/mev.c

+++ b/mev.c

@@ -138,6 +138,7 @@

 	fd = open("/dev/kbd", OREAD);

 	if(fd < 0)

 		sysfatal("open: %r");

+	memset(buf, 0, sizeof buf);

 	for(;;){

 		if(buf[0] != 0){

 			n = strlen(buf)+1;

--- a/tev.c

+++ b/tev.c

@@ -57,6 +57,7 @@

 	fd = open("/dev/kbd", OREAD);

 	if(fd < 0)

 		sysfatal("open: %r");

+	memset(buf, 0, sizeof buf);

 	for(;;){

 		if(buf[0] != 0){

 			n = strlen(buf)+1;