fanotify: Replace zero-length array with flexible-array

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]

sizeof(flexible-array-member) triggers a warning because flexible array
members have incomplete type[1]. There are some instances of code in
which the sizeof operator is being incorrectly/erroneously applied to
zero-length arrays and the result is zero. Such instances may be hiding
some bugs. So, this work (flexible-array member conversions) will also
help to get completely rid of those sorts of issues.

This issue was found with the help of Coccinelle.

[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] KSPP#21
[3] commit 7649773 ("cxgb3/l2t: Fix undefined behaviour")

Link: https://lore.kernel.org/r/20200507185230.GA14229@embeddedor
Signed-off-by: Gustavo A. R. Silva <[email protected]>
Signed-off-by: Jan Kara <[email protected]>

Author: GustavoARSilva

fs/notify/fanotify/fanotify.h

@@ -89,7 +89,7 @@ struct fanotify_name_event {
 	__kernel_fsid_t fsid;
 	struct fanotify_fh dir_fh;
 	u8 name_len;
-	char name[0];
+	char name[];
 };
 
 static inline struct fanotify_name_event *