[efi] Avoid unnecessarily passing pointers to EFI_HANDLEs

efi_file_install() and efi_download_install() are both used to install
onto existing handles.  There is therefore no need to allow for each
of their calls to InstallMultipleProtocolInterfaces() to create a new
handle.

By passing the handle directly (rather than a pointer to the handle),
we avoid potential confusion (and erroneous debug message colours).

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/image/efi_image.c

 	}
 
 	/* Install file I/O protocols */
-	if ( ( rc = efi_file_install ( &snpdev->handle ) ) != 0 ) {
+	if ( ( rc = efi_file_install ( snpdev->handle ) ) != 0 ) {
 		DBGC ( image, "EFIIMAGE %p could not install file protocol: "
 		       "%s\n", image, strerror ( rc ) );
 		goto err_file_install;
 	}
 
 	/* Install iPXE download protocol */
-	if ( ( rc = efi_download_install ( &snpdev->handle ) ) != 0 ) {
+	if ( ( rc = efi_download_install ( snpdev->handle ) ) != 0 ) {
 		DBGC ( image, "EFIIMAGE %p could not install iPXE download "
 		       "protocol: %s\n", image, strerror ( rc ) );
 		goto err_download_install;

src/include/ipxe/efi/efi_download.h

     0x3eaeaebd, 0xdecf, 0x493b, { 0x9b, 0xd1, 0xcd, 0xb2, 0xde, 0xca, 0xe7, 0x19 } \
   }
 
-extern int efi_download_install ( EFI_HANDLE *device );
-extern void efi_download_uninstall ( EFI_HANDLE device );
+extern int efi_download_install ( EFI_HANDLE handle );
+extern void efi_download_uninstall ( EFI_HANDLE handle );
 
 #endif /* _IPXE_DOWNLOAD_H */

src/include/ipxe/efi/efi_file.h

  *
  */
 
-extern int efi_file_install ( EFI_HANDLE *handle );
+extern int efi_file_install ( EFI_HANDLE handle );
 extern void efi_file_uninstall ( EFI_HANDLE handle );
 
 #endif /* _IPXE_EFI_FILE_H */

src/interface/efi/efi_download.c

  * @v handle		EFI handle
  * @ret rc		Return status code
  */
-int efi_download_install ( EFI_HANDLE *handle ) {
+int efi_download_install ( EFI_HANDLE handle ) {
 	EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
 	EFI_STATUS efirc;
 	int rc;
 
 	efirc = bs->InstallMultipleProtocolInterfaces (
-			handle,
+			&handle,
 			&ipxe_download_protocol_guid,
 			&ipxe_download_protocol_interface,
 			NULL );

src/interface/efi/efi_file.c

  * @v handle		EFI handle
  * @ret rc		Return status code
  */
-int efi_file_install ( EFI_HANDLE *handle ) {
+int efi_file_install ( EFI_HANDLE handle ) {
 	EFI_BOOT_SERVICES *bs = efi_systab->BootServices;
 	union {
 		EFI_DISK_IO_PROTOCOL *diskio;
 	 * handle just to keep things looking normal.
 	 */
 	if ( ( efirc = bs->InstallMultipleProtocolInterfaces (
-			handle,
+			&handle,
 			&efi_block_io_protocol_guid,
 			&efi_block_io_protocol,
 			&efi_disk_io_protocol_guid,
 	 * of calls to our DRIVER_STOP method when starting the EFI
 	 * shell.  I have no idea why this is.
 	 */
-	if ( ( efirc = bs->OpenProtocol ( *handle, &efi_disk_io_protocol_guid,
+	if ( ( efirc = bs->OpenProtocol ( handle, &efi_disk_io_protocol_guid,
 					  &diskio.interface, efi_image_handle,
-					  *handle,
+					  handle,
 					  EFI_OPEN_PROTOCOL_BY_DRIVER ) ) != 0){
 		rc = -EEFI ( efirc );
 		DBGC ( handle, "Could not open disk I/O protocol: %s\n",
 
 	return 0;
 
-	bs->CloseProtocol ( *handle, &efi_disk_io_protocol_guid,
-			    efi_image_handle, *handle );
+	bs->CloseProtocol ( handle, &efi_disk_io_protocol_guid,
+			    efi_image_handle, handle );
  err_open:
 	bs->UninstallMultipleProtocolInterfaces (
-			*handle,
+			handle,
 			&efi_simple_file_system_protocol_guid,
 			&efi_simple_file_system_protocol,
 			&efi_disk_io_protocol_guid,