drivers/char/vt.c: check kmalloc() return value.

index 87587b4..6aa08cb 100644
@@ -2640,6 +2640,15 @@ static int __init con_init(void)
 	 */
 	for (currcons = 0; currcons < MIN_NR_CONSOLES; currcons++) {
 		vc_cons[currcons].d = vc = alloc_bootmem(sizeof(struct vc_data));
+		if (!vc_cons[currcons].d) {
+			for (--currcons; currcons >= 0; currcons--) {
+				kfree(vc_cons[currcons].d);
+				vc_cons[currcons].d = NULL;
+			}
+			release_console_sem();
+			return -ENOMEM;
+		}
+
 		visual_init(vc, currcons, 1);
 		vc->vc_screenbuf = (unsigned short *)alloc_bootmem(vc->vc_screenbuf_size);
 		vc->vc_kmalloced = 0;