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pemencode: handle base64 input length < 3, fix bogus zero termination

--- a/sys/src/cmd/auth/pemencode.c

+++ b/sys/src/cmd/auth/pemencode.c

@@ -48,11 +48,11 @@

 			break;

 		tot += n;

 	}

-	buf[tot] = 0;

-	cbuf = malloc(2*tot);

+	len = 2*tot+3;

+	cbuf = malloc(len);

 	if(cbuf == nil)

 		sysfatal("malloc: %r");

-	len = enc64(cbuf, 2*tot, (uchar*)buf, tot);

+	len = enc64(cbuf, len, (uchar*)buf, tot);

 	print("-----BEGIN %s-----\n", tag);

 	while(len > 0){

 		print("%.64s\n", cbuf);