Fix vmem_gettext() when not supported.

src/conio/ciolib.c

@@ -1396,9 +1396,10 @@ CIOLIBEXPORT int CIOLIBCALL ciolib_vmem_gettext(int a,int b,int c,int d,struct v
 		buf = malloc((c-a+1)*(d-b+1)*sizeof(*buf));
 		if (buf == NULL)
 			return 0;
-		ret = ciolib_gettext(a, b, c, d, e);
+		ret = ciolib_gettext(a, b, c, d, buf);
 		if (ret) {
 			for (i=0; i<(c-a+1)*(d-b+1); i++) {
+				memset(&e[i], 0, sizeof(e[0]));
 				e[i].ch = buf[i] & 0xff;
 				e[i].legacy_attr = buf[i] >> 8;
 			}