lib/tst_clocks.c: fix 'tst_clock_gettime()' and 'tst_clock_settime()'

The type of 'struct tst_ts' has to be kept between function calls
because a function can be called with the wrong timespec type.
For that reason, a 'static' identifier is added for 'tts'
in 'tst_clock_gettime()' and 'tst_clock_settime()' as to make sure
the right timespec type is passed in 'clock_gettime()' and
'clock_settime()'.

Signed-off-by: Filip Bozuta <Filip.Bozuta@syrmia.com>
Reviewed-by: Cyril Hrubis <chrubis@suse.cz>

Author: bozutaf

lib/tst_clocks.c

@@ -57,7 +57,7 @@ int tst_clock_getres(clockid_t clk_id, struct timespec *res)
 
 int tst_clock_gettime(clockid_t clk_id, struct timespec *ts)
 {
-	struct tst_ts tts = { 0, };
+	static struct tst_ts tts = { 0, };
 	static mysyscall func;
 	int ret;
 
@@ -87,7 +87,7 @@ int tst_clock_gettime(clockid_t clk_id, struct timespec *ts)
 
 int tst_clock_settime(clockid_t clk_id, struct timespec *ts)
 {
-	struct tst_ts tts = { 0, };
+	static struct tst_ts tts = { 0, };
 	static mysyscall func;
 
 #if (__NR_clock_settime64 != __LTP__NR_INVALID_SYSCALL)