[LTP] TST_BRK_SUPPORTS_ONLY_TCONF_TBROK() error message

[Petr Vorel]

Hi Jan,

> your commit 0738e3753 ("lib: build check parameters for tst_brk()") added check
> for invalid types. I guess we didn't find a way how to print meaningful error
> message e.g. "tst_brk(): invalid type, please use TBROK/TCONF/TFAIL" as Xiao
> suggested [1]. Because error message on tst_brk(TINFO, "foo") is a bit
> confusing:
At least on gcc 8.3.

> ../../../../include/tst_common.h:69:25: error: size of unnamed array is negative
>   do { ((void)sizeof(char[1 - 2 * !!(condition)])); } while (0)

Kind regards,
Petr