[PATCH i-g-t 2/2] tests/intel/xe_madvise: Fix the type for sighandler_t

[Bernd Kuhls <bernd@kuhls.net>]

__sighandler_t is private interface in glibc so its
better to not use it, as an aside fixes build with musl

Patch was inspired by
https://lists.gnu.org/r/bug-time/2025-03/msg00000.html

Fixes build error seen with musl-based toolchains:

../tests/intel/xe_madvise.c: In function ‘test_dontneed_after_mmap’:
../tests/intel/xe_madvise.c:400:48: error: ‘__sighandler_t’ undeclared
 (first use in this function); did you mean ‘sighandler_t’?
  400 |          old_sigsegv = signal(SIGSEGV, (__sighandler_t)sigtrap);

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
---
 tests/intel/xe_madvise.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tests/intel/xe_madvise.c b/tests/intel/xe_madvise.c
index 3d36be941..a33a08630 100644
--- a/tests/intel/xe_madvise.c
+++ b/tests/intel/xe_madvise.c
@@ -397,8 +397,8 @@ static void test_dontneed_after_mmap(int fd)
 		char *ptr = (char *)map;
 		int sig;
 
-		old_sigsegv = signal(SIGSEGV, (__sighandler_t)sigtrap);
-		old_sigbus = signal(SIGBUS, (__sighandler_t)sigtrap);
+		old_sigsegv = signal(SIGSEGV, (sighandler_t)sigtrap);
+		old_sigbus = signal(SIGBUS, (sighandler_t)sigtrap);
 
 		sig = sigsetjmp(jmp, 1); /* savemask=1: save/restore signal mask */
 		switch (sig) {
-- 
2.47.3