Fix LoadKernel()

src/platform/vboot_reference/vboot_firmware/include/kernel_image_fw.h

 /* Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  *
  * Data structure and API definitions for a verified boot kernel image.
  * (Firmware Portion)
  */
 
 #ifndef VBOOT_REFERENCE_KERNEL_IMAGE_FW_H_
 #define VBOOT_REFERENCE_KERNEL_IMAGE_FW_H_
@@ skipping 114 matching lines @@
  * using the firmware public key [firmware_key_blob]. If [dev_mode] is 1
  * (active), then key header verification is skipped.
  *
  * On success, fills in the fields of image with the kernel header and
  * preamble fields.
  *
  * Note that pointers in the image point directly into the input
  * kernel_header_blob.  image->kernel_data is set to NULL, since it's not
  * part of the header and preamble data itself.
  *
- * The signing key to use for kernel data verification is returned in
- * [kernel_sign_key], This must be free-d explicitly by the caller after use.
+ * On success, the signing key to use for kernel data verification is
+ * returned in [kernel_sign_key], This must be free-d explicitly by
+ * the caller after use.  On failure, the signing key is set to NULL.
  *
  * Returns 0 on success, error code on failure.
  */
 int VerifyKernelHeader(const uint8_t* firmware_key_blob,
                        const uint8_t* kernel_header_blob,
                        uint64_t kernel_header_blob_len,
                        const int dev_mode,
                        KernelImage* image,
                        RSAPublicKey** kernel_sign_key);
 
@@ skipping 11 matching lines @@
  */
 int VerifyKernel(const uint8_t* signing_key_blob,
                  const uint8_t* kernel_blob,
                  const int dev_mode);
 
 /* Returns the logical version of a kernel blob which is calculated as
  * (kernel_key_version << 16 | kernel_version). */
 uint32_t GetLogicalKernelVersion(uint8_t* kernel_blob);
 
 #endif  /* VBOOT_REFERENCE_KERNEL_IMAGE_FW_H_ */