treewide: uapi: 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:
(linux-5.19-rc2$ 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
  ];
};

-fstrict-flex-arrays=3 is coming and we need to land these changes
to prevent issues like these in the short future:

../fs/minix/dir.c:337:3: warning: 'strcpy' will always overflow; destination buffer has size 0,
but the source string has length 2 (including NUL byte) [-Wfortify-source]
		strcpy(de3->name, ".");
		^

Since these are all [0] to [] changes, the risk to UAPI is nearly zero. If
this breaks anything, we can use a union with a new member name.

[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
Build-tested-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/lkml/62b675ec.wKX6AOZ6cbE71vtF%25lkp@intel.com/
Acked-by: Dan Williams <dan.j.williams@intel.com> # For ndctl.h
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>

include/uapi/linux/sctp.h

@@ -365,7 +365,7 @@ struct sctp_assoc_change {
 	__u16 sac_outbound_streams;
 	__u16 sac_inbound_streams;
 	sctp_assoc_t sac_assoc_id;
-	__u8 sac_info[0];
+	__u8 sac_info[];
 };
 
 /*
@@ -436,7 +436,7 @@ struct sctp_remote_error {
 	__u32 sre_length;
 	__be16 sre_error;
 	sctp_assoc_t sre_assoc_id;
-	__u8 sre_data[0];
+	__u8 sre_data[];
 };
 
 
@@ -453,7 +453,7 @@ struct sctp_send_failed {
 	__u32 ssf_error;
 	struct sctp_sndrcvinfo ssf_info;
 	sctp_assoc_t ssf_assoc_id;
-	__u8 ssf_data[0];
+	__u8 ssf_data[];
 };
 
 struct sctp_send_failed_event {
@@ -463,7 +463,7 @@ struct sctp_send_failed_event {
 	__u32 ssf_error;
 	struct sctp_sndinfo ssfe_info;
 	sctp_assoc_t ssf_assoc_id;
-	__u8 ssf_data[0];
+	__u8 ssf_data[];
 };
 
 /*
@@ -1029,7 +1029,7 @@ struct sctp_getaddrs_old {
 struct sctp_getaddrs {
 	sctp_assoc_t		assoc_id; /*input*/
 	__u32			addr_num; /*output*/
-	__u8			addrs[0]; /*output, variable size*/
+	__u8			addrs[]; /*output, variable size*/
 };
 
 /* A socket user request obtained via SCTP_GET_ASSOC_STATS that retrieves