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[cc] Finalize temporary buffer in path()

--- a/src/cmd/cc/posix/cc.c

+++ b/src/cmd/cc/posix/cc.c

@@ -113,8 +113,10 @@

 		cnt += len;

 	}

-	if (cnt != FILENAME_MAX)

+	if (cnt < FILENAME_MAX) {

+		buff[cnt] = '\0';

 		return xstrdup(buff);

+	}

 too_long:

 	die("cc: too long pathname");