firmware_class: fix typo in error path

In the error path, _request_firmware sets
firmware_p to NULL rather than *firmware_p,
which leads to passing a freed firmware
struct to drivers when the firmware file
cannot be found. Fix this.

Broken by commit f8a4bd3.

Reported-by: Wey-Yi Guy <[email protected]>
Signed-off-by: Johannes Berg <[email protected]>
Acked-by: Dmitry Torokhov <[email protected]>
Signed-off-by: Pekka Enberg <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

drivers/base/firmware_class.c

@@ -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;