Fix potential NULL pointer dereference if kstrdup failed

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>

---

Index: linux-2.6.git/drivers/misc/thinkpad_acpi.c
===================================================================
--- linux-2.6.git.orig/drivers/misc/thinkpad_acpi.c	2008-04-16 20:35:34.000000000 +0400
+++ linux-2.6.git/drivers/misc/thinkpad_acpi.c	2008-04-16 20:36:38.000000000 +0400
@@ -5826,7 +5826,7 @@ static void __init get_thinkpad_model_da
 
 	tp->model_str = kstrdup(dmi_get_system_info(DMI_PRODUCT_VERSION),
 					GFP_KERNEL);
-	if (strnicmp(tp->model_str, "ThinkPad", 8) != 0) {
+	if (tp->model_str && strnicmp(tp->model_str, "ThinkPad", 8) != 0) {
 		kfree(tp->model_str);
 		tp->model_str = NULL;
 	}

-- 
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