lib/ts_kmp.c: 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
inadvertenly introduced[3] to the codebase from now on.

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: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/20200211205948.GA26459@embeddedorSigned-off-by: Linus Torvalds <torvalds@linux-foundation.org>

lib/ts_kmp.c

@@ -36,7 +36,7 @@ struct ts_kmp
 {
 	u8 *		pattern;
 	unsigned int	pattern_len;
-	unsigned int 	prefix_tbl[0];
+	unsigned int	prefix_tbl[];
 };
 
 static unsigned int kmp_find(struct ts_config *conf, struct ts_state *state)