firewire: fix warnings to generate UAPI documentation

Any target to generate UAPI documentation reports warnings to missing
annotation for padding member in structures added recently.

This commit suppresses the warnings.

Reported-by: Stephen Rothwell <[e-mail]>
Closes: https://lore.kernel.org/lkml/[e-mail]/
Fixes: 7c22d4a92bb2 ("firewire: cdev: add new event to notify request subaction with time stamp")
Fixes: fc2b52cf2e0e ("firewire: cdev: add new event to notify response subaction with time stamp")
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Takashi Sakamoto <[e-mail]>

include/uapi/linux/firewire-cdev.h

···
  * @length:	Data length, i.e. the response's payload size in bytes
  * @request_tstamp:	The time stamp of isochronous cycle at which the request was sent.
  * @response_tstamp:	The time stamp of isochronous cycle at which the response was sent.
+ * @padding:	Padding to keep the size of structure as multiples of 8 in various architectures
+ *		since 4 byte alignment is used for 8 byte of object type in System V ABI for i386
+ *		architecture.
  * @data:	Payload data, if any
  *
  * This event is sent when the stack receives a response to an outgoing request
···
 	__u32 length;
 	__u32 request_tstamp;
 	__u32 response_tstamp;
-	/*
-	 * Padding to keep the size of structure as multiples of 8 in various architectures since
-	 * 4 byte alignment is used for 8 byte of object type in System V ABI for i386 architecture.
-	 */
 	__u32 padding;
 	__u32 data[];
 };
···
  * @handle:	Reference to the kernel-side pending request
  * @length:	Data length, i.e. the request's payload size in bytes
  * @tstamp:	The time stamp of isochronous cycle at which the request arrived.
+ * @padding:	Padding to keep the size of structure as multiples of 8 in various architectures
+ *		since 4 byte alignment is used for 8 byte of object type in System V ABI for i386
+ *		architecture.
  * @data:	Incoming data, if any
  *
  * This event is sent when the stack receives an incoming request to an address
···
 	__u32 handle;
 	__u32 length;
 	__u32 tstamp;
-	/*
-	 * Padding to keep the size of structure as multiples of 8 in various architectures since
-	 * 4 byte alignment is used for 8 byte of object type in System V ABI for i386 architecture.
-	 */
 	__u32 padding;
 	__u32 data[];
 };