treewide: Replace zero-length arrays with flexible-array members

There is a regular need in the kernel to provide a way to declare
having a dynamically sized set of trailing elements in a structure.
Kernel code should always use “flexible array members”[1] for these
cases. The older style of one-element or zero-length arrays should
no longer be used[2].

This code was transformed with the help of Coccinelle:
(next-20220214$ spatch --jobs $(getconf _NPROCESSORS_ONLN) --sp-file script.cocci --include-headers --dir . > output.patch)

@@
identifier S, member, array;
type T1, T2;
@@

struct S {
...
T1 member;
T2 array[
- 0
];
};

UAPI and wireless changes were intentionally excluded from this patch
and will be sent out separately.

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.16/process/deprecated.html#zero-length-and-one-element-arrays

Link: https://github.com/KSPP/linux/issues/78
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

staging: greybus: add missing includes

Before moving greybus core out of staging and moving header files to
include/linux some greybus header files were missing the necessary
includes. This would trigger compilation faillures with some example
errors logged bellow for with CONFIG_KERNEL_HEADER_TEST=y.

So, add the necessary headers to compile clean before relocating the
header files.

./include/linux/greybus/hd.h:23:50: error: unknown type name 'u16'
int (*cport_disable)(struct gb_host_device *hd, u16 cport_id); ^~~
./include/linux/greybus/greybus_protocols.h:1314:2: error: unknown type name '__u8'
__u8 data[0];
^~~~
./include/linux/greybus/hd.h:24:52: error: unknown type name 'u16'
int (*cport_connected)(struct gb_host_device *hd, u16 cport_id); ^~~
./include/linux/greybus/hd.h:25:48: error: unknown type name 'u16'
int (*cport_flush)(struct gb_host_device *hd, u16 cport_id); ^~~
./include/linux/greybus/hd.h:26:51: error: unknown type name 'u16'
int (*cport_shutdown)(struct gb_host_device *hd, u16 cport_id, ^~~
./include/linux/greybus/hd.h:27:5: error: unknown type name 'u8'
u8 phase, unsigned int timeout);
^~
./include/linux/greybus/hd.h:28:50: error: unknown type name 'u16'
int (*cport_quiesce)(struct gb_host_device *hd, u16 cport_id, ^~~
./include/linux/greybus/hd.h:29:5: error: unknown type name 'size_t'
size_t peer_space, unsigned int timeout);
^~~~~~
./include/linux/greybus/hd.h:29:5: note: 'size_t' is defined in header '<stddef.h>'; did you forget to '#include <stddef.h>'?
./include/linux/greybus/hd.h:1:1:
+#include <stddef.h>
/* SPDX-License-Identifier: GPL-2.0 */
./include/linux/greybus/hd.h:29:5:
size_t peer_space, unsigned int timeout);
^~~~~~
./include/linux/greybus/hd.h:30:48: error: unknown type name 'u16'
int (*cport_clear)(struct gb_host_device *hd, u16 cport_id); ^~~
./include/linux/greybus/hd.h:32:49: error: unknown type name 'u16'
int (*message_send)(struct gb_host_device *hd, u16 dest_cport_id, ^~~
./include/linux/greybus/hd.h:33:32: error: unknown type name 'gfp_t'
struct gb_message *message, gfp_t gfp_mask); ^~~~~
./include/linux/greybus/hd.h:35:55: error: unknown type name 'u16'
int (*latency_tag_enable)(struct gb_host_device *hd, u16 cport_id);

Reported-by: kbuild test robot <lkp@intel.com>
Reported-by: Gao Xiang <hsiangkao@aol.com>
Signed-off-by: Rui Miguel Silva <rmfrfs@gmail.com>
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Link: https://lore.kernel.org/r/20190827155302.25704-1-rui.silva@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

staging: greybus: move core include files to include/linux/greybus/

With the goal of moving the core of the greybus code out of staging, the
include files need to be moved to include/linux/greybus.h and
include/linux/greybus/

Cc: Vaibhav Hiremath <hvaibhav.linux@gmail.com>
Cc: Johan Hovold <johan@kernel.org>
Cc: Vaibhav Agarwal <vaibhav.sr@gmail.com>
Cc: Rui Miguel Silva <rmfrfs@gmail.com>
Cc: David Lin <dtwlin@gmail.com>
Cc: "Bryan O'Donoghue" <pure.logic@nexus-software.ie>
Cc: greybus-dev@lists.linaro.org
Cc: devel@driverdev.osuosl.org
Acked-by: Mark Greer <mgreer@animalcreek.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Alex Elder <elder@kernel.org>
Link: https://lore.kernel.org/r/20190825055429.18547-8-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>