bttv: Bt832 - fix possible NULL pointer deref

Index: linux-2.6.git/drivers/media/video/bt8xx/bt832.c
===================================================================
@@ -97,6 +97,11 @@ int bt832_init(struct i2c_client *i2c_cl
 	int rc;
 
 	buf=kmalloc(65,GFP_KERNEL);
+	if (!buf) {
+		v4l_err(&t->client,
+			"Unable to allocate memory. Detaching.\n");
+		return 0;
+	}
 	bt832_hexdump(i2c_client_s,buf);
 
 	if(buf[0x40] != 0x31) {

@@ -211,7 +216,12 @@ bt832_command(struct i2c_client *client,
 	switch (cmd) {
 		case BT832_HEXDUMP: {
 			unsigned char *buf;
-			buf=kmalloc(65,GFP_KERNEL);
+			buf=kmalloc(65, GFP_KERNEL);
+			if (!buf) {
+				v4l_err(&t->client,
+					"Unable to allocate memory\n");
+				break;
+			}
 			bt832_hexdump(&t->client,buf);
 			kfree(buf);
 		}