[LTP] lib: Introduce tst_path.h to consolidate system paths

[linuxtestproject.agent@gmail.com]

Hi Li,

On Mon, 4 May 2026, Li Wang wrote:
> lib: Introduce tst_path.h to consolidate system paths

> +#define PROC_SYS_USER	"/proc/sys/user/"

userns08.c includes tst_test.h (line 24), which now includes tst_path.h
added by this same patch, so PROC_SYS_USER is already visible. This local
definition causes a -Wmacro-redefined warning. Remove it.

> +#endif /* TST_PATH_H */

The guard symbol is TST_PATH__, so the comment should read
/* TST_PATH__ */ to match.

> +	SAFE_FILE_SCANF(PROC_SYS_KERNEL	"pid_max", "%d\n", &inval_pgid);

A few replacement sites (pidns05.c, userns06_capcheck.c, waitid10.c,
userns01.c) have a tab between the macro and the string literal instead
of a single space like the rest of the patch.

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