nfs: Replace zero-length array with flexible-array member

The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:

struct foo {
        int stuff;
        struct boo array[];
};

By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.

Also, notice that, dynamic memory allocations won't be affected by
this change:

"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]

This issue was found with the help of Coccinelle.

[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 76497732 ("cxgb3/l2t: Fix undefined behaviour")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

fs/nfs/dir.c

@@ -141,7 +141,7 @@ struct nfs_cache_array {
 	int size;
 	int eof_index;
 	u64 last_cookie;
-	struct nfs_cache_array_entry array[0];
+	struct nfs_cache_array_entry array[];
 };
 
 typedef struct {

fs/nfs/nfs4proc.c

@@ -5550,7 +5550,7 @@ static int buf_to_pages_noslab(const void *buf, size_t buflen,
 struct nfs4_cached_acl {
 	int cached;
 	size_t len;
-	char data[0];
+	char data[];
 };
 
 static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)