firmware: fix request_firmware() error handling

If _request_firmware() fails and we do release_firmware(), update the pointer pointed to by 'firmware_p' so that we don't return a free'd pointer to the caller.

This patch fixes a boot-time crash on my MacBook that's caused by failing isight_firmware_load(). The bug was introduced in commit f8a4bd34 ("firmware
loader: embed device into firmware_priv structure") and makes 2.6.36-rc1 unusable on my box.

---
Here's a picture of the oops:

http://twitpic.com/2h76gv

Unfortunately I don't have a serial console hooked up so I couldn't get a text version of it.

 drivers/base/firmware_class.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

index c8a44f5..40af43e 100644
@@ -568,7 +568,7 @@ static int _request_firmware(const struct firmware **firmware_p,
 out:
 	if (retval) {
 		release_firmware(firmware);
-		firmware_p = NULL;
+		*firmware_p = NULL;
 	}
 
 	return retval;

1.6.3.3

Thanks, already in my tree and linux-next and will be going to Linus on Monday.

greg k-h