selftests/timens: Make run_tests() functions static

These functions are never used outside their defining compilation unit and
can be made static.

Link: https://lore.kernel.org/r/20250502-selftests-timens-fixes-v1-2-fb517c76f04d@linutronix.de
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Reviewed-by: Muhammad Usama Anjum <usama.anjum@collabora.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>

Author: t-8ch

tools/testing/selftests/timens/clock_nanosleep.c

@@ -38,7 +38,7 @@ void *call_nanosleep(void *_args)
 	return NULL;
 }
 
-int run_test(int clockid, int abs)
+static int run_test(int clockid, int abs)
 {
 	struct timespec now = {}, rem;
 	struct thread_args args = { .now = &now, .rem = &rem, .clockid = clockid};

tools/testing/selftests/timens/timer.c

@@ -15,7 +15,7 @@
 #include "log.h"
 #include "timens.h"
 
-int run_test(int clockid, struct timespec now)
+static int run_test(int clockid, struct timespec now)
 {
 	struct itimerspec new_value;
 	long long elapsed;

tools/testing/selftests/timens/timerfd.c

@@ -22,7 +22,7 @@ static int tclock_gettime(clock_t clockid, struct timespec *now)
 	return clock_gettime(clockid, now);
 }
 
-int run_test(int clockid, struct timespec now)
+static int run_test(int clockid, struct timespec now)
 {
 	struct itimerspec new_value;
 	long long elapsed;